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X-WR-CALDESC:Events for UNAM Nanoteknoloji Araştırma Merkezi
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TZID:Europe/Moscow
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TZOFFSETFROM:+0300
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DTSTART:20210101T000000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20240417T133000
DTEND;TZID=Europe/Moscow:20240417T143000
DTSTAMP:20260905T155640
CREATED:20240415T104850Z
LAST-MODIFIED:20240415T131258Z
UID:8681-1713360600-1713364200@unam.bilkent.edu.tr
SUMMARY:The Sound of Music at the Nanoscale – Exploring the Nanoscale World with NEMS Resonators Based on Low Dimensional Nanomaterials
DESCRIPTION:Zenghui Wang\nUniversity of Electronic Science and Technology of China \n\nThe Sound of Music at the Nanoscale – Exploring the Nanoscale World with NEMS Resonators Based on Low Dimensional Nanomaterials \nThe advent of low-dimensional nanostructures has enabled a plethora of new devices and systems. Among them\, nanoelectromechanical systems (NEMS) offers the unique capability of coupling the exquisite material properties found in these atomically-defined nanostructures with their mechanical degree of freedom\, opening new opportunities for exploring exotic phenomena at the nanoscale. In particular\, as these devices driven into mechanical vibration—just as musical instruments—they become essentially nanoscale guitars\, drums\, tuning folks\, etc. By studying the infinitesimal mechanical vibrations in these nanoscale “music instruments”\, i.e.\, listening to the “sound of music” at the nanoscale\, researchers can study a number of fundamental physical processes such as absorption\, phase transition\, anisotropy\, and nonlinear processes. \n \nAbout speaker\nZenghui Wang is currently a professor in the Institute of Frontier and Fundamental Sciences (IFFS) at the University of Electronic Science and Technology of China (UESTC). His research interests and expertise primarily focus on nanoscale devices and systems\, particularly Nanoscale Resonators\, and High-Frequency Resonant Sensors & Transducers. Prior to joining Case\, during 2010-2012\, he worked at Cornell University as a postdoc researcher. He earned a Ph.D. degree (2010) from University of Washington\, Seattle\, for building an ultra-high frequency NEMS resonant sensor with an individual single-walled carbon nanotube\, and using it to detect and study the low-dimensional phase transitions of the atomic layer adsorbed on the nanotube surface. He is an expert on studies of emerging nanoscale devices and sensors based on new materials such as carbon nanotubes\, graphene\, and other low-dimensional nanomaterials\, and has published 20+ research articles in peer-reviewed journals\, including Science\, Nature Physics\, Nature Nanotechnology\, Nature Communications\, Science Advances\, Nano Letters\, ACS Nano\, Physical Review Letters\, 2D Materials\, etc.\,. He has given dozens of invited talks and seminars at peer-reviewed conferences and research universities. He is an Associate Editor for Micro and Nano Letters\, and has been serving on the Technical Program Committees for IEEE IFCS\, IEEE Nano\, and the MEMS/NEMS Technical Group at the American Vacuum Society (AVS) International Symposium and Exhibition. \n \n  \n  \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/the-sound-of-music-at-the-nanoscale-exploring-the-nanoscale-world-with-nems-resonators-based-on-low-dimensional-nanomaterials/
CATEGORIES:UNAM Seminars
ATTACH;FMTTYPE=image/png:https://unam.bilkent.edu.tr/en/wp-content/uploads/2024/04/Zenghui-Wang.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20240417T110000
DTEND;TZID=Europe/Moscow:20240417T143000
DTSTAMP:20260905T155640
CREATED:20240415T075937Z
LAST-MODIFIED:20240415T080032Z
UID:8675-1713351600-1713364200@unam.bilkent.edu.tr
SUMMARY:The path to no-drift sensors with on-chip stress calibration
DESCRIPTION:Erdinç Tatar\nBilkent University – Electrical and Electronics Engineering\, UNAM \n\nThe path to no-drift sensors with on-chip stress calibration \nNavigation is vital for the future of autonomous mobility.  Data from multiple sensing modalities (GPS\, camera\, radar\, …) are fused in navigation.  Among these sensors\, inertial navigation is error-proof and can fit into every car and smartphone if a low-cost\, no-drift sensor is invented.  Drift is a major problem for inertial sensors\, limiting their utilization in navigation applications.  Inertial sensor data\, i.e.\, acceleration and rotation\, is integrated to find the position\, and drift leads to unacceptable position error over time.  The common drift suppression approach is temperature calibration\, but various works have shown that it cannot eliminate the drift.  The drift mechanisms are complex and cannot be fully characterized by simple temperature measurements.  So\, I propose an on-chip stress calibration approach that directly correlates with the drift. We integrate multiple stress sensors and the inertial sensor on the same chip and achieve state of the art drift performance with on-chip stress sensing.  Functional calibration requires deep understanding of the device and temperature effects.  I will present our drift solution approach\, which includes sensor and electronics design\, analytical modeling\, and combining temperature and stress measurements. \n \nAbout speaker\nErdinc Tatar is an Assistant Professor in the Department of Electrical and Electronics Engineering at Bilkent University.  He is also affiliated with National Nanotechnology Center of Turkey (UNAM).  He received B.S. and M.S. degrees (with high honors) in Electrical and Electronics Engineering from Middle East Technical University (METU)\, Ankara\, Turkey\, and Ph.D. degree in Electrical and Computer engineering from Carnegie Mellon University\, Pittsburgh\, PA\, in 2008\, 2010\, and 2016 respectively. \nHe was a Graduate Research Assistant with Micro-Electro-Mechanical Systems Research and Applications Center\, METU\, and with Carnegie Mellon University from 2008 to 2011\, and 2012 to 2016\, respectively.  From 2016 to 2019 he worked as a MEMS Design Engineer responsible for the development of next generation gyroscopes in Analog Devices\, Inc.\, Wilmington\, MA.  His research interests include MEMS sensors (specifically Inertial and Gas sensors)\, microfabrication and packaging technologies\, and readout and control electronics for MEMS sensors. \nDr. Tatar is a recipient of International Fellowship for Outstanding Researchers by TUBITAK\, Marie Skłodowska-Curie Actions (MSCA) Fellowship and European Research Council (ERC) Starting Grant by the European Union. \n \n  \n  \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/the-path-to-no-drift-sensors-with-on-chip-stress-calibration/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2024/04/etatar_photo.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20240306T110000
DTEND;TZID=Europe/Moscow:20240306T123000
DTSTAMP:20260905T155640
CREATED:20240228T132209Z
LAST-MODIFIED:20240228T132301Z
UID:8593-1709722800-1709728200@unam.bilkent.edu.tr
SUMMARY:Multiscale Simulation Approaches to Understanding the Control of Trafficking in Cells
DESCRIPTION:Philip Biggin\nBiochemistry – University of Oxford \n\nMultiscale Simulation Approaches to Understanding\nthe Control of Trafficking in Cells \nTrafficking receptors control protein localisation through the recognition of specific signal sequences that specify unique cellular locations. Differences in luminal or organellular pH are important for the vectorial trafficking of cargo receptors. The KDEL receptor is responsible for maintaining the integrity of the ER by retrieving luminally localised folding chaperones in a pH-dependent mechanism. Structural studies have revealed the end states of KDEL receptor activation and the mechanism of selective cargo binding. However\, precisely how the KDEL receptor responds to changes in luminal pH remains unclear. To address this key question of cell biology\, we have used a combination of X-ray crystallography\, cell-based assays and multi-scale simulation methods. In this talk I will discuss how we have used a variety of computational techniques including QM\, GCMC\, MD and coarse-grained MD to explain how this cellular trafficking works at the molecular level. \n \nKonuşmacı hakkında\nPhilip Biggin is Professor of Computational Biochemistry in the Department of Biochemistry at the University of Oxford. He studied Computer-aided Chemistry at the University of Surrey for his undergraduate degree before completing a DPhil (PhD) in molecular biophysics at the University of Oxford. He then obtained a Wellcome Trust International Prize Fellowship that allowed him to undertake post-doctoral work at the Salk Institute\, California. He returned to Oxford in 2000 for further post-doctoral work\, before being awarded a prestigious RCUK Fellowship (with tenure track) in 2007. In 2012 this post reverted automatically to an Associate Professor (tenured). In 2016 he was made Full Professor at the University of Oxford. \nHis interests are focussed on the development and application of computational methods with particular respect to membrane proteins and membrane-drug interactions. He has over 150 peer-reviewed publications in this field\, and has previously acted as a consultant to BioMedCentral. He served as Chair of the Molecular Graphics and Modelling Society for over 10 years and is a Fellow of the Royal Society of Chemistry (FRSC) as well as a chartered chemist (CChem). He is a member of the British Biophysical Society and the US Biophysical Society. He was a founder member of CCPBioSim and HECBioSim committees that aim to promote the application of high-performance computing to biological problems. He also chaired allocation panels on PRACE – the European supercomputing facility. He has also served on the REF panel\, which is responsible for assessing the quality of UK science every seven years. His group has an excellent record in developing new approaches\, from assessing conformational states via normal mode analysis\, to a novel way to compare X-ray crystallographic data with molecular dynamics simulations and a way to align protein structures purely on the basis of their dynamics. \n \n  \n  \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/multiscale-simulation-approaches-to-understanding-the-control-of-trafficking-in-cells/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/png:https://unam.bilkent.edu.tr/en/wp-content/uploads/2024/02/Philip-Biggin.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20240228T110000
DTEND;TZID=Europe/Moscow:20240228T123000
DTSTAMP:20260905T155640
CREATED:20240226T064237Z
LAST-MODIFIED:20240226T064237Z
UID:8581-1709118000-1709123400@unam.bilkent.edu.tr
SUMMARY:Security printing with laser-induced plasmonic colors
DESCRIPTION:Nathalie Destouches\nUniversity Jean Monnet\, Saint Etienne \n\nSecurity printing with laser-induced plasmonic colors \nPlasmonic colors have garnered significant attention in recent years due to their anticipated profound impact on various industrial sectors. These colors\, stemming from the resonant interaction between light and metallic nanostructures\, offer stability over time and can be fabricated as thin films. The ability to control the shape and organization of metallic nanostructures further provides spectral sensitivity to light polarization\, enabling the development of innovative applications. \n  \nLaser-induced printing of a color image on a Ag:TiO2 thin film observed in reflection with polarized light for angle 1 (left)\, or 2 (middle) or in transmission under non-polarized light.  \nThis presentation explores the diverse physical and chemical mechanisms induced by lasers on plasmonic metasurfaces composed of silver nanoparticles embedded in a TiO2 thin film. Under continuous wave (cw)\, nanosecond\, or femtosecond1 laser exposure\, silver nanoparticles undergo reshaping\, shrinking\, or growth\, and self-organize along subwavelength gratings. Various laser-induced self-organized nanostructures are identified and their origins are elucidated through optical models. Once formed\, these self-organized nanostructures exhibit intriguing dichroic optical properties\, whose origin\, elucidated through electromagnetic modeling\, lies in the hybridization of resonant modes.2 These singular optical properties present opportunities for innovation\, particularly in high-end anti-counterfeiting applications. Laser-induced printed image multiplexing emerges as a recently developed inkless technique\, providing high flexibility to print multiplexed colored images observable independently under natural light by altering the viewing angle.3 \nReferences \n\nDestouches\, et al. Laser-empowered metasurfaces for white light image multiplexing Adv. Func. Mater. 2010430 (2021)\nD. Le\, et al. Understanding and exploiting the optical properties of laser-induced quasi-random plasmonic metasurfaces ACS Appl. Opt. Mater.\, accepted (2024)\nDalloz\, et al. Anti-counterfeiting white light printed image multiplexing by fast nanosecond laser processing Adv. Mater.\, 34\, 2104054 (2022)\n\nKonuşmacı hakkında\nNathalie Destouches is Professor at University Jean Monnet\, Saint-Etienne\, France. She leads projects at the interface between materials science and photonics and she is particularly interested in the interaction of light with plasmonic metasurfaces. She coordinates the Erasmus Mundus Joint Master Degree Photonics for Security Reliability Sustainability and Safety. Her main scientific contributions have led to the development of plasmonic photochromic materials\, to the elucidation of different laser-triggered mechanisms in plasmonic films\, to the explanation of the electromagnetic response of random plasmonic metasurfaces\, to the simulation of metallic nanoparticle growth under dynamic laser irradiation\, or to the explanation of special thermal behavior in dynamic laser processes. These fundamental studies led to the development of laser printing of color and multiplexed images in collaboration with a leading security document company. \n  \n \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/security-printing-with-laser-induced-plasmonic-colors/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/png:https://unam.bilkent.edu.tr/en/wp-content/uploads/2024/02/nd_p.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20240131T110000
DTEND;TZID=Europe/Moscow:20240131T120000
DTSTAMP:20260905T155640
CREATED:20240117T134603Z
LAST-MODIFIED:20240117T134603Z
UID:8447-1706698800-1706702400@unam.bilkent.edu.tr
SUMMARY:SESAME and Research Opportunities
DESCRIPTION:Mustafa Fatih Genişel\nSESAME \n\nSESAME and Research Opportunities \nSynchrotron-Light for Experimental Science and Applications in the Middle East (SESAME) is a “third-generation” synchrotron light source that was officially opened in Allan (Jordan) on 16 May 2017. It is the first synchrotron light source in the Middle East and neighbouring countries\, and also the region’s first major international centre of excellence.\nThe heart of SESAME is a 2.5 GeV synchrotron light source (133m in circumference)\, providing radiation from the Infrared light to X-rays of unparalleled quality\, a unique tool to expand the boundaries of scientific investigations into new materials and living matter.\nThere are five operational beamline and one under construction. The beamlines are the following: \n1.BM02 – IR (Infrared) spectromicroscopy beamline\n2.BM08 – XAFS/XRF (X-ray Absorption Fine Structure/X-ray Fluorescence) spectroscopy beamline\n3.ID09 – MS/XPD (Materials Science/X-ray Powder Diffraction) beamline\n4.ID10 – BEATS (BEAmline for Tomography at SESAME)\n5.ID11L – HESEB (HElmholtz-SEsame Beamline)\n6.ID11R – TXPES (Turkish soft X-ray PhotoElectron Spectroscopy) beamline – this beamline is being constructed by a Turkish consortium led by TENMAK (Turkish Energy\, Nuclear and Mineral Research Agency);\nIt is now possible to apply for proposals to the five operational beamlines of SESAME\, the deadline is on February 29th 2024\, at 23:59 Jordanian time for the user period starting from September 1st to December 31st\, 2024. \n \nPicture of SESAME storage ring; Bending Magnet (RED)\, Beam shifter of BEATS beamline (VIOLET) and HESEB undulator (BLUE) \nKonuşmacı hakkında\nDr. Mustafa Fatih Genişel is the HESEB beamline scientist at SESAME. Mustafa Genisel received his BS and PhD degrees in Chemistry from Middle East Technical University and Bilkent University\, respectively. He was a faculty member at Dicle University before joining SESAME. His research studies focus on PVD hard coatings and characterization. \n  \n \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/sesame-and-research-opportunities/
CATEGORIES:UNAM Seminars
ATTACH;FMTTYPE=image/png:https://unam.bilkent.edu.tr/en/wp-content/uploads/2024/01/Mustafa-Fatih-Genisel.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20231218T110000
DTEND;TZID=Europe/Moscow:20231218T123000
DTSTAMP:20260905T155640
CREATED:20231213T115653Z
LAST-MODIFIED:20231213T115653Z
UID:8110-1702897200-1702902600@unam.bilkent.edu.tr
SUMMARY:Molecular technologies in wine production
DESCRIPTION:Irina Mitina\nTechnical University of Moldova \n\nMolecular technologies in wine production \nViticulture and winemaking in Moldova have a history of many centuries and are an inseparable part of life and culture of Moldovan people. The country is located between latitude 46-47˚\, similar to other renowned wine regions in Europe\, and has a climate favorable for the production of quality wine. In spite of the country’s small size (the area is ~33.8 km²)\, Moldova is among the top 20 largest wine producers and ranks 13th in terms of wine exports in the world. Essentially\, wine production is a microbiological process where yeasts and bacteria play the key role. For example\, Saccharomyces yeast convert grape sugars to ethanol during alcoholic fermentation\, while lactic acid bacteria convert malic acid into lactic acid during malolactic fermentation. However\, there are a lot of yeast and bacteria associated with grapes and wines\, and not all of them are beneficial. Some species\, even though capable of alcoholic or malolactic fermentations\, produce various secondary metabolites with undesirable sensory qualities\, thus behaving as ‘wine spoilers’. Early detection of such wine spoilers would allow winemakers to take quick decisions related to wine treatment. Traditionally\, the methods of detection of wine spoilers included plating and colony count. Recently\, DNA-based methods of detection and quantification of wine spoilage microorganisms have been developed. Some issues related to detection and quantification of the most common wine spoilers will be discussed in this talk. \nKonuşmacı hakkında\nI am a molecular biology scientist currently working at the Technical University of Moldova on wine microbiology\, in the national project “Improving of food quality and safety through biotechnology and food engineering”\, bilateral research and innovation project TÜBİTAK- NARD (Türkiye — Moldova) “Detecting Minute Spoilage in Wine through a Handheld Device in the Field” and State University of Moldova on soil and plant associated microorganisms\, in the national project “Long-term ex situ conservation of plant genetic resources in the Gene Bank using the methods of molecular biology for plant germplasm health testing”. I completed my PhD in genetics in the Academy of Sciences of Moldova (2002) and had postdoctoral appointments at several universities\, including University of California at Berkeley (USA)\, Seoul National University (South Korea)\, Universidad Andres Bello (Santiago\, Chile). My research interests lie in the field of microbiome research\, in particular how the microbiome composition can affect the quality of the final product. \n  \n \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/molecular-technologies-in-wine-production/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2023/12/Irina_Mitina.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20231116T153000
DTEND;TZID=Europe/Moscow:20231116T170000
DTSTAMP:20260905T155640
CREATED:20231108T075500Z
LAST-MODIFIED:20231108T075500Z
UID:8049-1700148600-1700154000@unam.bilkent.edu.tr
SUMMARY:Quantum Material Integrated Optoelectronics for Disruptive Technologies
DESCRIPTION:Emre Ozan Polat\nKadir Has University \n\nQuantum Material Integrated Optoelectronics for Disruptive Technologies \nDespite the significant progress on the wafer-based optoelectronics\, providing a broad optical response with a mechanically robust and optically seamless device structure remains as an outstanding challenge. This challenge mainly hinders the realization of disruptive technologies such as hyperspectral imaging and skin-integration of wearables for clinically accurate telemedicine. In this talk\, I will briefly explain some novel nanomaterial-based approaches and the resulting devices that I have developed to provide solutions for image sensing\, optical extraction of vital signs\, and manipulation of light in broad range of wavelengths. By focusing on the physics lying behind the demonstrated novel optoelectronic devices\, I will show the results of my research that benefits from the intrinsic mechanical flexibility and charge carrier properties of low dimensional materials. To show the promises of my approaches\, I will share information on the proof-of-concept devices and provide methodological insight into the CMOS integration and wearable use of quantum materials empowering next generation optoelectronics for hyperspectral imaging and telemedicine. \n \n  \n  \nKonuşmacı hakkında\nDr. Emre Ozan Polat is an Assistant Professor at the Mechatronics Engineering Department of Kadir Has University. He works on the quantum material integrated sensor systems and optoelectronic applications of two-dimensional materials. His PhD research (İhsan Doğramacı Bilkent University\, Physics) reports the development of graphene-based optoelectronic devices that work in the visible spectrum. After PhD\, he obtained several Marie Curie and EU fellowships to join University of Glasgow\, (UK) and ICFO-The Institute of Photonic Sciences (Spain)\, where he developed humanitarian technologies using light-matter interactions. He is an author of 30+ publications\, book chapters\, patent applications and projects. He is awarded ”BAGEP 2021 Physics Award” of Bilim Akademisi\, “Innovator of The Year” of Spanish Foundation of Science and Technology (2017)\, Silver Leaf Award” of IEEE (2015)\, and “Young Scientist Award” of European Material Research Society (E-MRS) (2014). \n  \n\n 
URL:https://unam.bilkent.edu.tr/en/event/quantum-material-integrated-optoelectronics-for-disruptive-technologies/
CATEGORIES:UNAM Thursday Seminars
ATTACH;FMTTYPE=image/png:https://unam.bilkent.edu.tr/en/wp-content/uploads/2023/11/Emre-Ozan-Polat.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20231110T160000
DTEND;TZID=Europe/Moscow:20231110T170000
DTSTAMP:20260905T155640
CREATED:20231106T124821Z
LAST-MODIFIED:20231106T124821Z
UID:8036-1699632000-1699635600@unam.bilkent.edu.tr
SUMMARY:Molding the flow of waves in complex media: imaging\, trapping\, and shaping
DESCRIPTION:Arthur Goetschy\nESPCI Paris \n\nMolding the flow of waves in complex media: imaging\, trapping\, and shaping \nThe study of waves in complex systems has evolved profoundly over the last decade\, with the demonstration of rich and useful effects that cannot be explained by the traditional diffusion model of wave propagation. In photonic systems in particular\, recent developments in disorder engineering and wavefront shaping protocols have enabled spectacular demonstrations of light manipulation\, such as tunable transparency\, focusing or enhanced energy delivery in opaque materials. In this talk\, we propose to review some of our recent achievements in this field. Concrete examples will include imaging through disordered systems\, study of correlated materials with bandgap and localization properties\, optimization of dwell-time\, and transport of entangled photons in multiple-scattering systems. \n \n  \n  \nAbout Speaker\nArthur Goetschy is an Associate Professor and theoretical physicist at ESPCI Paris. His research activities focus on the control of waves in complex media\, light-matter interactions\, and quantum optics. He developed during his PhD a framework to characterize the collective excitations of non-Hermitian Hamiltonians\, with applications for random lasers\, photonic glasses\, or cold atom gases. In 2012\, he joined the group of Doug Stone at Yale University\, where he established a random matrix formalism for the open channels of scattering systems\, which has been successfully applied to enhance focusing\, energy deposition\, or absorption in wavefront-shaping experiments. Since his hiring in 2014 at Institut Langevin\, he has proposed original models to harness dwell-time\, synchronization\, information\, bandgaps\, or localization in random or strongly correlated photonic structures\, using classical or quantum entangled light. \n 
URL:https://unam.bilkent.edu.tr/en/event/molding-the-flow-of-waves-in-complex-media-imaging-trapping-and-shaping/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2023/11/Arthur-Goetschy.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20231108T153000
DTEND;TZID=Europe/Moscow:20231108T170000
DTSTAMP:20260905T155640
CREATED:20231031T104028Z
LAST-MODIFIED:20231031T104028Z
UID:8022-1699457400-1699462800@unam.bilkent.edu.tr
SUMMARY:Effect of surface charged groups on colloidal\, optical properties and cellular uptake of inorganic nanoparticles
DESCRIPTION:Mikhail Artemyev\nBelarusian State University \n\nEffect of surface charged groups on colloidal\, optical properties and cellular uptake of inorganic nanoparticles \nSurface charged groups play enormous role in colloidal stabilization of inorganic nanoparticles in aqueous solutions. They also govern such important characteristics\, as electrophoretic mobility\, ability to electrostatic interaction with different objects from solid surfaces to biomolecules. Here\, I present our recent results on how to introduce different types of charged groups in the surface shell of semiconductor and metal nanoparticles\, how the sign and the magnitude of the surface charge and the type of groups affect colloidal stability of nanoparticles in aqueous media. Surprisingly\, the surface charge affects not only their electrophoretic mobility\, but indirectly their hydrodynamic size measured by DLS. Both strong negative and positive surface charge is capable to quench the photoluminescence of semiconductor quantum dots and cause a spectral shift of plasmon resonances in silver nanoparticles. Moreover\, various types of cells demonstrate selective uptake of colloidal quantum dots with specific surface charge. All of that demonstrates practical perspectives for utilization of charged plasmonic and semiconductor nanoparticles as the optical nano-sensors and markers. \n  \n  \nAbout Speaker\nGraduated chemistry department of BSU in 1985. Defended Ph.D. in physical chemistry in 1991\, in 2009 defended Dr.Sci. thesis. From 1985 up to now is an employee of RIPCP\, from 2010 head of laboratory of nanochemistry. The main scientific activities lie in the synthesis of colloidal semiconductor and metal nanoparticles\, investigating their optical properties\, photochemical and electrochemical behavior\, interaction with biomolecules and cells. Published more than 200 scientific papers\, IF =45. \n 
URL:https://unam.bilkent.edu.tr/en/event/effect-of-surface-charged-groups-on-colloidal-optical-properties-and-cellular-uptake-of-inorganic-nanoparticles/
CATEGORIES:UNAM Seminars
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2023/10/Mikhail-Artemyev.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20231020T160000
DTEND;TZID=Europe/Moscow:20231020T170000
DTSTAMP:20260905T155640
CREATED:20231018T080219Z
LAST-MODIFIED:20231018T080231Z
UID:7952-1697817600-1697821200@unam.bilkent.edu.tr
SUMMARY:Quantum Computers\, Quantum Sensors\, and Magnets
DESCRIPTION:Michael E. Flatté\nThe University of Iowa \n\nRecent advances in quantum technologies\, including room-temperature quantum operations on quantum bits (“qubits”)\, suggest the field is rapidly progressing towards practical quantum sensors and computers. However a major challenge remains how to connect these qubits together. Some types of qubits are very small\, making it very difficult to get wires in to address them individually. Some other types\, like the most advanced superconducting qubits\, are very big\, making it difficult to put very many of them into a single fridge. I will describe some general approaches to linking qubits together on the micron scale required for practical integration of many qubits\, as well as some potential advantages to using magnetic materials as “linkers”. Recent practical demonstrations of linking behavior are creating a new subfield of quantum research based on magnetic excitations\, or magnons\, entitled Quantum Coherent Magnonics. \n \n  \n  \nAbout Speaker\nMichael E. Flatté received the A.B. degree in physics from Harvard University\, Cambridge\, MA\, USA\, in 1988\, and the Ph.D. degree in physics from the University of California at Santa Barbara\, Santa Barbara\, CA\, USA\, in 1992. He is a Professor at the Department of Physics and Astronomy\, The University of Iowa (UI)\, Iowa City\, IA\, USA. After his post-doctoral work at the Institute for Theoretical Physics\, University of California at Santa Barbara\, and the Division of Applied Sciences\, Harvard University\, he joined the faculty at UI in 1995. He has over 270 publications and ten patents. He has an adjunct appointment as a Professor at the Department of Applied Physics\, Eindhoven University of Technology\, Eindhoven\, The Netherlands. His research interests include optical and electrical control of spin dynamics in materials\, novel spintronic devices\, quantum sensors\, and solid-state realizations of quantum computation. Dr. Flatté is a fellow of the American Association for the Advancement of Science and the American Physical Society. \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/quantum-computers-quantum-sensors-and-magnets/
CATEGORIES:Nanocolloquium Series
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20231013T160000
DTEND;TZID=Europe/Moscow:20231013T170000
DTSTAMP:20260905T155640
CREATED:20231018T075909Z
LAST-MODIFIED:20231018T075928Z
UID:7943-1697212800-1697216400@unam.bilkent.edu.tr
SUMMARY:Micro/nano processing technology for metamaterials
DESCRIPTION:Yoshiaki Kanamori\nTohoku University \n\nMicro/nano processing technology is one of the important elements for achieving the academic progress and industrialization of metamaterials. There are strong expectations for the establishment of micro/nano fabrication technology to produce metamaterials that meet needs. Here\, the metamaterials developed in my research group and their microfabrication technologies are discussed. \n(i) Hydrogen annealing techniques\nBy promoting the self-diffusion of silicon surface atoms in a high-temperature hydrogen atmosphere\, the shape of the silicon surface can be deformed in the order of micro/nano meter. A structural color device (I) for visible light can be fabricated using this technology\, and a silicon dielectric metamaterial with a target size can be fabricated at a target location. \n(ii) Silicon direct bonding technologies\nWe have developed a technology to fabricate an anti-reflection metasurface on the slope of a silicon prism (II)\, which is difficult to fabricate with a normal semiconductor process\, and have realized high-efficiency terahertz light sources. \n(iii) Micro-electromechanical systems (MEMS)\nA MEMS-driven reconfigurable metamaterial device fabrication technology has been developed. We have developed tunable filters for optical communication and 6G communication systems (III). A part of this work was supported by JST\, CREST Grant Number JPMJCR2102\, Japan. \n \n  \n  \nAbout Speaker\n  \nDr. Yoshiaki Kanamori\, earned his Ph.D. in Engineering from the Department of Mechanical and Electronic Engineering at Tohoku University\, in 2001\, and he assumed the role of Assistant Professor at the Graduate School of Engineering. He was a visiting researcher between 2002 and 2003 at the Laboratory of Photonics and Nanostructure\, in CNRS\, France. Dr. Kanamori was appointed as an Associate Professor at the Graduate School of Engineering in 2007 and later professor in 2019. Previously\, he was the director of the Micro and Nanomachining Research and Education Center (MNC). Dr. Kanamori assumed the position of Director at the Metamaterials Research and Innovation Center (Meta-RIC) and joined Green Future Creation Organization at Tohoku University. \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/micro-nano-processing-technology-for-metamaterials/
CATEGORIES:Nanocolloquium Series
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20230415T140000
DTEND;TZID=Europe/Moscow:20230415T180000
DTSTAMP:20260905T155640
CREATED:20230413T123849Z
LAST-MODIFIED:20230413T124450Z
UID:7625-1681567200-1681581600@unam.bilkent.edu.tr
SUMMARY:The World Quantum Day Celebrated at UNAM
DESCRIPTION:In honor of the World Quantum Day\, Bilkent University’s National Nanotechnology Research Center (UNAM) will be holding an event on Saturday\, April 15 in partnership with QTurkey. \nThe World Quantum Day has been celebrated since April 14\, 2021\, with the aims of creating social awareness about quantum technologies and increasing the interest and knowledge levels of individuals who will develop and use these technologies in the future. This year\, QTurkey is organizing the event in both online and face-to-face formats in Istanbul\, Ankara\, and Izmir. Additional support will be provided by student branches from QSB ÇOMÜ\, QSB Bilkent\, QSB SU\, QSB KU\, QSB MSGSU\, QSB TOBB ETÜ\, QSB IZTECH\, QSB TGU\, QSB GTU\, QSB İTÜ\, QSB METU\, and QSB Marmara. \nSpeakers at the event will include Asst. Prof. Hasan Yılmaz and Asst. Prof. İbrahim Sarpkaya from UNAM\, Prof. Dr. Oğuz Gülseren and Asst. Prof. Cihan Okay from Bilkent University\, Asst. Prof. Osman Barış Malcıoğlu from METU\, and Assoc. Prof. Murat Kurt from Ondokuz Mayıs University. \nRegister: \n14 Nisan Dünya Kuantum Günü \n \nProgram:\n14:40 Climbing the Full Universal Density Functional Ladder Using Quantum Machine Learning – Asst. Prof. Barış Malcıoğlu \n15:10 Quantum Light in Complex Systems – Asst. Prof. Hasan Yılmaz \n15:40 Quantum Arithmetic from Qubits to Qudits – Assoc. Prof. Murat Kurt \n16:40 Materials for Quantum Technologies – Prof. Dr. Oğuz Gülseren \n17:10 Quantum Light Sources in Low-Dimensional Materials – Asst. Prof. İbrahim Sarpkaya
URL:https://unam.bilkent.edu.tr/en/event/the-world-quantum-day-celebrated-at-unam/
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20230407T160000
DTEND;TZID=Europe/Moscow:20230407T170000
DTSTAMP:20260905T155640
CREATED:20230403T120948Z
LAST-MODIFIED:20230403T120948Z
UID:7562-1680883200-1680886800@unam.bilkent.edu.tr
SUMMARY:Structure Control in Biomimetic Hybrid Membranes: From Molecular Engineering to In-operando Characterisation
DESCRIPTION:Amin Sadeghpour Dilmaghani\nUniversity of Leeds \n\nThe properties and function of advanced materials in biomimetic environments are associated with their morphology\, hierarchy\, anisotropy and mechanical properties. For instance\, the structural morphology of biopolymer networks in cellular scaffolds is known to play important roles in cellular adhesion and proliferation\, controlling the tissue homeostasis. The ability to engineer nanostructured soft materials with multiscale hierarchy by sustainable approaches (e.g. free of chemical cross linking)\, yet offering appropriate porosity and mechanical stability remains a great challenge in engineering advanced functional food and biomaterials.\nIn this seminar\, I will present our recent development in fabrication of novel hybrid lipid-polymer membranes by introducing unique nanostructures from lipid self-assemblies into biopolymer networks.1\, 2 I will also discuss the state of the art in-situ X-ray scattering analytical methods that we applied to understanding of structure-function correlations in hybrid systems and their potential applications as cell substrates. \n \n1. Yuan\, Y.; Shi\, Y.; Banerjee\, J.; Sadeghpour\, A.; Azevedo\, H. S.\, Materials Today Bio 2023\, 100598.\n2. Tien\, N. D.; Maurya\, A. K.; Fortunato\, G.; Rottmar\, M.; Zboray\, R.; Erni\, R.; Dommann\, A.; Rossi\, R. M.; Neels\, A.; Sadeghpour\, A.\, Langmuir 2020\, 36 (40)\, 11787-11797. \n  \n  \nAbout Speaker\n  \nDr. Amin Sadeghpour is a Lecturer in Food Nanostructures and Processing at the School of Food Science and Nutrition\, the University of Leeds\, UK. His expertise is in the area of colloids & functional nanomaterials and the application of Small- and Wide-Angle X-ray Scattering (SAXS/WAXS) techniques. Amin received his PhD in Colloids and Surface Chemistry from the University of Geneva in Switzerland under the supervision of Prof Michal Borkovec. Prior to his current position\, Amin was appointed a leading position at the Centre for X-ray Analytics of Empa – the Swiss Federal Laboratories of Materials Science and Technology.\nAmin’s research focuses on understanding the correlations between the soft matter nanostructures and their interactions with the biological environment. He is particularly interested in the design\, processing and characterisation of biomimetic systems\, i.e.\, in lipid-polymer hybrid materials with responsive nanoscale hierarchy and controlled functions for applications in food bioprocessing and nutraceutical delivery. His research includes the development and application of in-situ X-ray analytics (SAXS/WAXS) to elucidate the structural dynamics in the advanced materials. \nZoom Conference \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/structure-control-in-biomimetic-hybrid-membranes-from-molecular-engineering-to-in-operando-characterisation/
CATEGORIES:Nanocolloquium Series
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20221125T160000
DTEND;TZID=Europe/Moscow:20221125T170000
DTSTAMP:20260905T155640
CREATED:20221121T112949Z
LAST-MODIFIED:20230403T121046Z
UID:7076-1669392000-1669395600@unam.bilkent.edu.tr
SUMMARY:Novel electronic properties of quantum critical Dirac plasma
DESCRIPTION:Alexey Berdyugin\nThe National University of Singapore \n\nThe most recognizable feature of graphene’s electronic spectrum is its Dirac point around which interesting phenomena tend to cluster. At elevated temperatures thermal excitations can overcome the disorder and create an electron-hole (e-h) plasma of Dirac fermions. The Dirac plasma has recently been found to exhibit unusual properties including quantum critical conductivity and hydrodynamic flow.\nFirst\, I’ll discuss our recent work on magnetotransport properties of Dirac plasma in graphene. In low magnetic field\, the plasma exhibits giant magnetoresistivity reaching >100% in 0.1 T even at room temperature. This is orders of magnitude higher than magnetoresistivity found in any other system at such temperatures and originates from the exceptional mobility of graphene at the neutrality point. With the onset of Landau quantization in a few T\, where the e-h plasma resides on the zeroth Landau level\, giant linear magnetoresistivity emerges which is sensitive to the Columb interaction in the system.\nIn the second part of my talk\, I’ll discuss the out-of-equilibrium transport in twisted bilayer graphene and other graphene superlattices which is\, surprisingly\, closely related to the Dirac plasma. Due to small number of carriers and reduced Fermi velocity\, even moderate current bias in those systems produces a strong shift of Fermi surface. That leads to the current-critical behavior with superconducting-like IV curves. Criticalities develop when the drift velocity of electrons flow approach the Fermi velocity of the system. The observed anomaly caused by the Schwinger-like production of electron-hole plasma. The observed behavior is expected to be common for all 2D superlattices. \n  \n  \n  \nAbout Speaker\n  \nProf Alexey Berdyugin studied at the Moscow Phystech (which is the most prestigious university for natural science in Russia) from 2010 to 2016\, where he received his bachelor and master degrees in condensed matter physics. Next\, he conducted doctoral research at the University of Manchester under the supervision of Sir. Andre Geim and Prof. Irina Grigorieva. During that time\, he has been focusing on the transport properties of novel van der Waals materials. He received his PhD in Nanoscience in May 2020. After that\, he carried on his work in United Kingdom and focused on a non-linear current propagation regime in novel 2D superlattices. Recently he has received a prestigious NUS Presidential Young Professorship award and joined the MSE and Physics departments. \nUNAM Conference Hall\, \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/novel-electronic-properties-of-quantum-critical-dirac-plasma/
CATEGORIES:Nanocolloquium Series
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20221014T160000
DTEND;TZID=Europe/Moscow:20221014T170000
DTSTAMP:20260905T155640
CREATED:20221010T073501Z
LAST-MODIFIED:20221010T073501Z
UID:6804-1665763200-1665766800@unam.bilkent.edu.tr
SUMMARY:Spintronics with novel two-dimensional materials
DESCRIPTION:Ahmet Avsar\nThe National University of Singapore \n\nExploitation of the intrinsic spin of an electron\, spintronics\, could facilitate the development of multifunctional and novel devices. As regards to material selection\, two-dimensional (2D) crystals and their van der Waals heterostructures could enable new spintronics functionalities that are inaccessible in conventional bulk materials [1]. To exploit the full potential of such heterostructures\, the family of 2D spin transport and magnetic materials needs to be expanded. \nIn this talk\, I will present our efforts in exploring novel materials for this emerging field. Firstly\, I will introduce ultra-thin\, semiconducting black phosphorus as a promising spin transport channel material and discuss our recent efforts focused on investigating the impact of its unique crystal structure on spin dynamics [2]. Then\, I will demonstrate inducing magnetism into an otherwise non-magnetic 2D material with the creation of some specific types of defects [3]. Finally\, I will provide an outlook about the potential of heterostructures based on such novel 2D materials for fundamental spintronics research and applications in information storage and logic devices. \n[1] A. Avsar et al.\, Rev. Mod. Phys. 92\, 021003 (2020).\n[2] A. Avsar et al.\, Nat. Phys. 13\, 888-894 (2017) & L. Cording et al.\, submitted.\n[3] A. Avsar et al.\, Nat. Nano.\, 14\, 674-678 (2019) & A. Avsar et al.\, Nat. Comm.\, 11\, 4806 (2020). \n \n  \n  \nAbout Speaker\n  \nDr Ahmet Avsar is an Assistant Professor and NRF Fellow in the Department of Material Science and Engineering at the National University of Singapore (NUS). Prior to joining NUS\, he was an Assistant Professor of Physics at Newcastle University (United Kingdom)\, and worked as an EPFL Fellow (co-funded by the European Marie Curie COFUND programme) at the Swiss Federal Institute of Technology Lausanne (EPFL\, Switzerland) between 2016 and 2020 after completing his PhD in Physics at NUS.\nAs an experimental condensed matter physicist specialized in two-dimensional (2D) materials\, Ahmet Avsar is interested in exploitation of the multiple quantum degrees of freedom (spin\, pseudospin and valley) available to 2D materials in the ultimate atomically thin limit for applications in energy-efficient information technologies (For more information: https://sites.google.com/site/aavsar). \nTopic: UNAM Nanocolloquium Series \nTime: Oct 14\, 2022 04:00 PM  \nHybrid Event \nUNAM Conference Hall\, \n& \nJoin Zoom Meeting \nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09\nMeeting ID: 587 688 4794\nPasscode: 871377 \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/spintronics-with-novel-two-dimensional-materials/
CATEGORIES:Nanocolloquium Series
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20221007T160000
DTEND;TZID=Europe/Moscow:20221007T170000
DTSTAMP:20260905T155640
CREATED:20220928T063521Z
LAST-MODIFIED:20220928T063553Z
UID:6785-1665158400-1665162000@unam.bilkent.edu.tr
SUMMARY:Perfect transfer of waves
DESCRIPTION:Q-Han Park\nKorea University \n\nWaves\, both classical and quantum\, are reflected when they encounter different media or potential regions. Reflection is a fundamental property of waves underlying numerous scientific applications. Nevertheless\, in many cases removing reflection is a key issue to secure transmission and increase device efficiencies. Since the early works of Brewster and Rayleigh\, much effort has been made to remove reflection\, or achieve so called anti-reflection (AR). The most well-known AR coating\, based on a simple interference principle of optics\, only works for specific frequencies and incidence angles. Despite efforts to extend AR to broader frequency\, progress was achieved mainly by the trial-and-error optimization in designing multilayer AR structures. So far\, AR has been regarded as a technological issue without much room for further fundamental understanding. \nHere\, we uncover a principle of universal impedance matching (UIM) that allows a complete removal of reflection regardless of the incidence angle and the frequency of incoming waves. In the case of electromagnetic waves\, we reformulate the Maxwell’s equation in terms of impedance and admittance functions and directly establish the inverse scattering relation between scattered fields and material parameters\, i.e.\, permittivity and permeability. Particularly\, from the inverse scattering relation we find that the perfectly vanishing reflection\, omnidirectional and frequency independent\, can be explicitly realized by spatiotemporally dispersive materials. As a demonstration\, we introduce an UIM coating that enables the perfect transmission of white light in heterogeneous transparent media. We also present an experimental realization of UIM using metamaterials. \nThe complete removal of reflection based on UIM can be extended to various physical situations\, such as light reflection at curved surface interfaces\, reflection at the junction two different waveguides\, total internal reflections\, reflection of acoustic and elastic waves and reflection of quantum matter waves at potential steps. We explain how UIM can be extended to these physical systems and applied to practical devices. \n \n  \n  \nAbout Speaker\n  \nDr. Q-Han Park is currently Professor in Physics at Korea University in South Korea. He received his Ph.D. degree in Physics from Brandeis University\, United States in 1987. He was a Postdoctoral Research Fellow at University of Cambridge with Stephen Hawking from 1990 to 1992. Afterwards he was a research associate at CERN\, Switzerland\, a visiting scholar at MIT\, United States\, and a senior visiting fellow at the Institute of Optics\, United States. He then joined Kyunghee University in South Korea as Assistant Professor in 1992\, and moved to Korea University in 2001. \nDr. Park served as a director of Research Institute Basic Sciences in Korea\, and an associated editor for Optics Express of the Optical Society of America. Dr. Park is currently Fellow of the Korean Academy of Science and Technology\, American Optical Society\, Optical Society of Korea\, and Korean Physical Society. He is also serving as Director of the Center for Electromagnetic Metamaterials of Korea University and Consultant of Samsung Advanced Institute of Technology. He has received the prestigious Korean Science Award by the Ministry of Science and ICT in 2020. \nDr. Park’s research has been focused on high energy physics until the year of 2000 and switched to the field of optics. Since then\, he published high impact papers on optics including five papers in Nature Photonics and holds 35 patents. In earlier works\, he made significant theoretical advances in Plasmonics. His recent research topics include universal impedance matching and non-local metamaterials. He has authored more than 200 journal articles and 47 patents. More details can be found on his homepage (http://nol.korea.ac.kr/). \nTopic: Nanocolloquium Series\nTime: Oct 7\, 2022 04:00 PM Istanbul\nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09\nMeeting ID: 587 688 4794\nPasscode: 871377 \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/perfect-transfer-of-waves/
CATEGORIES:Nanocolloquium Series
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220922T153000
DTEND;TZID=Europe/Moscow:20220922T173000
DTSTAMP:20260905T155640
CREATED:20220921T142400Z
LAST-MODIFIED:20220921T142400Z
UID:6759-1663860600-1663867800@unam.bilkent.edu.tr
SUMMARY:Next Generation Biomonitoring: Implementing Machine Learning for Accurate Metabarcoding with Nanopore MinION
DESCRIPTION:Bilgenur Baloğlu\nUniversity of Southern California \n\nMetabarcoding (identification of the plant\, animal\, and fungal taxa present in an environmental sample) rapidly gains importance in ecology\, food safety\, pest identification\, and disease surveillance. NGS metabarcoding has a compelling advantage over traditional approaches for obtaining data on species distributions\, however\, it is often difficult to detect all the species present in a bulk sample using NGS. This can – in parts – be attributed to shorter read lengths most NGS instruments generate. Moreover\, most NGS platforms are not portable\, making in situ field-based sequencing not feasible. Oxford Nanopore sequencing platforms such as the MinION represent an exception to that and they are also known to provide longer reads albeit limited by rather high error rates (~12-15%). We used a freshwater mock community of 50 Operational Taxonomic Units (OTU) to test the capacity of the Oxford Nanopore MinION coupled with a rolling circle amplification protocol to provide long read metabarcoding results. We established a workflow for DNA metabarcoding of freshwater organisms using the Nanopore MinION sequencing platform. We also propose a new Python pipeline that explores error profiles of nanopore consensus sequences\, mapping accuracy\, and overall community representation of a complex bulk sample. Using our molecular and bioinformatics workflow that implements a machine learning algorithm\, we were able to accurately estimate the diversity of the tested freshwater mock community with an average sequence accuracy of >99% for 1D2 sequencing on the nanopore platform. We could also show that the high error rates associated with long-read single molecule sequencing can be mitigated by using a rolling circle amplification protocol. Future bioassessment programs will tremendously benefit from portable\, highly accurate\, species-level metabarcoding and it appears that we reached a point were cost-effective field-based DNA metabarcoding is possible \n \n  \nAbout Speaker\n  \nBilgenur Baloglu\, Ph.D. is a molecular biologist\, bioinformatics scientist\, and a lecturer\, based in Pasadena\, California. She studied Molecular Biology and Genetics at Istanbul Technical University and earned a Ph.D. at the National University of Singapore in Molecular Ecology\, working on the biological assessment of Singapore’s aquatic ecosystems using Next Generation Sequencing (NGS) and Nanopore sequencing. Her research interests focus on biodiversity monitoring and developing molecular and bioinformatics tools to make DNA sequencing technologies cheaper\, faster\, and more accurate. After completing her postdoctoral studies at the University of Guelph\, Canada\, she led bioinformatics efforts at Sequential Skin\, and moved to Thermo Fisher Scientific\, continuing work in bioinformatics support for NGS. She is also a part-time faculty at the University of Southern California\, teaching a course on genomic analysis using machine learning techniques. Her seminar will focus on the newly developed python based bioinformatics algorithm ASHURE that could improve the nanopore consensus sequence accuracy to >99% for bulk sample metabarcoding. \n  \n\n \n 
URL:https://unam.bilkent.edu.tr/en/event/next-generation-biomonitoring-implementing-machine-learning-for-accurate-metabarcoding-with-nanopore-minion/
CATEGORIES:UNAM Thursday Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220623T153000
DTEND;TZID=Europe/Moscow:20220623T170000
DTSTAMP:20260905T155640
CREATED:20220614T110849Z
LAST-MODIFIED:20220614T111212Z
UID:6659-1655998200-1656003600@unam.bilkent.edu.tr
SUMMARY:Connecting Atomic-scale Impurities to Larger Morphologies
DESCRIPTION:Nadire Nayir\nKaramanoglu Mehmetbey University/The Pennsylvania State University \n\n(Half) van der Waals epitaxy of single-crystal two-dimensional (2D) materials (e.g.\, TMD\, h-BN\, graphene\, group III materials) on substrates are quite challenging and time and source expensive. Therefore\, theoretically characterization of materials is essential to deepen our understanding of the physical and chemical properties of materials\, thus\, ensuring the highest quality in the design and manufacturing processes of materials.\nThis talk will first focus on our multiscale modeling efforts for the synthesis and characterization of 2D materials. I will show some of our own results which have been dedicated to addressing the major challenges encountered in experiments such as (i) unidirectional alignment of 2D domains on a substrate\, (ii) impact of the surface chemistry and crystallographic structure of a substrate on the van der Waals epitaxy\, (iii) unraveling gas-phase chemistry in chemical vapor deposition environment\, (iv) impact of growth conditions on the crystal structure of 2D materials. Additionally\, since technology is developing faster than ever before\, and increasingly depends on constantly advancing basic research and expanding scientific knowledge\, an effective-force field development for multicomponent systems has become crucial to accelerate the knowledge transfer to industry. In the second part\, this talk will also provide an overview of the ReaxFF force fields and multiscale model framework that we developed for 2D materials [4-6]. These potentials offer a computationally cost-effective and versatile research tool for the materials science community to study large-scale simulations of synthesis and defect-\, phase-\, strain-\, and edge engineering of a material of interest\, paving the way for increased application of atomic-level modeling of 2D materials. In turn\, new computational materials and new knowledge will benefit the society by advancing new technologies in energy conversion\, storage\, and other important areas. \n  \n1. N. Nayir\, M. Y. Sengul\, A. L. Costine\, P. Reinke\, S. Rajabpour\, A. Bansal\, A. Kozhakhmetov\, J. Robinson\, J. M. Redwing\, A. van Duin\, “Atomic-scale probing of defect-assisted Ga intercalation through graphene using ReaxFF Molecular Dynamics Simulations”\, Carbon\, 190\, 276–290 (2022)\n2. DR Hickey\, N Nayir\, M Chubarov\, TH Choudhury\, S Bachu\, L Miao\, Y. Wang\, C. Qian\, V. H. Crespi\, J. M. Redwing\, A. C. T. van Duin\, N. Alem “Illuminating Invisible Grain Boundaries in Coalesced Single-Orientation WS2 Monolayer Films”\, Nano Letters 21 (15)\, 6487-6495 (2021)\n3. N. Briggs\, B. Bersch\, Y. Wang\, J. Jiang\, R. J. Koch\, N. Nayir\, K. Wang\, M. Kolmer\, W. Ko\, A. D. L. F. Duran\, S. Subramanian\, C. Dong\, J. Shallenberger\, M. Fu\, Q. Zou\, Y. Chuang\, Z. Gai\, A. Li\, A. Bostwick\, C. Jozwiak\, C. Chang\, E. Rotenberg\, J. Zhu\, A. C. T. van Duin\, V. Crespi\, J. A. Robinson\, “Atomically thin half-van der Waals metals enabled by confinement heteroepitaxy”\, Nature Materials 19 (6)\, 637-643 (2020) 4. N. Nayir\, Y. K. Shin\, Y. Wang\, M. Y. Sengul\, D. Reifsnyder Hickey\, M. Chubarov\, T. H Choudhury\, N. Alem\, J. Redwing\, V. H Crespi\, A. CT van Duin\, “A ReaxFF Force Field for 2D-WS2 and Its Interaction with Sapphire”\, The Journal of Physical Chemistry C 125 (32)\, 17950-17961 (2021) 5. N. Nayir\, Y. Wang\, Y. Ji\, T. Choudhury\, J. M. Redwing\, L.-Q. Chen\, V. H. Crespi\, A. C. T. van Duin\, “Theoretical Modeling of Edge-controlled Growth Kinetics and Structural Engineering of 2D-MoSe2”\, Materials Science and Engineering: B 271\, 115263 (2021)\n6. Y. Xuan\, A. Jain\, S. Zafar\, R. Lotfi\, N. Nayir\, Y. Wang\, T. H. Choudhury\, S. Wright\, J. Feraca\, L. Rosenbaum\, J. M. Redwing\, V. Crespi\, A. C. T. van Duin\, “Multi-scale modeling of gas-phase reactions in metal-organic chemical vapor deposition growth of WSe2”\, Journal of Crystal Growth 527\, 125247 (2019) \n \nAbout The Speaker\nNadire Nayir is currently a postdoctoral research associate of Physics at Karamanoglu Mehmetbey University and a research affiliate of the 2-dimensional Crystal Consortium (2DCC) at The Pennsylvania State University. She received her BS in physics education from Selcuk University in 2009\, and Ph.D. in computational physics from Middle East Technical University in 2018. She worked as a postdoctoral associate of Mechanical Engineering at The Pennsylvania State University for 3 years. \nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09https://zoom.us/j/95581724217 \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/connecting-atomic-scale-impurities-to-larger-morphologies/
CATEGORIES:UNAM Thursday Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220615T123000
DTEND;TZID=Europe/Moscow:20220615T133000
DTSTAMP:20260905T155640
CREATED:20220614T062227Z
LAST-MODIFIED:20220614T062629Z
UID:6648-1655296200-1655299800@unam.bilkent.edu.tr
SUMMARY:Probing leaky and guided exciton-polaritons in resonant planar structures
DESCRIPTION:Anton Samusev\nITMO University \n\nPlanar periodic structures such as metasurfaces and photonic crystal slabs strongly coupled to an exciton resonance attract particular attention since they provide vast opportunities for on-demand engineering of the dispersion of guided and leaky polariton resonances. In this regard\, experimental characterization and control of the over modes’ dispersion is of great importance. In this talk\, I will show both what new physical phenomena appear in such systems and how these effects can be directly observed in the experiment. \nIn the first part of the talk\, I will show an experimental approach allowing to retrieve the real [1\, 2] or even full complex [3] dispersion of both leaky and evanescent waves in arbitrary planar structures. The method is based on back focal plane microspectroscopy combined with a solid immersion lens (SIL) separated from the sample by a precisely controlled nanoscale air gap (Otto geometry). Varying the gap allows for extracting both real and imaginary parts of the wavenumber of surface waves propagating in an arbitrary in-plane direction. \nIn the second part of the talk\, I will switch gears to another implication of dispersion engineering in planar structures – the possibility of realization of strong light-matter coupling regime with excitons in transition metal dichalcogenides [4\, 5] and perovskites [6]. I will highlight the nonlinear [4\, 6] and topological [5] properties of exciton polaritons in such systems enabled by finely tuned custom designs of the photonic band structure. \nFinally\, we will discuss how to directly observe and analyze guided exciton-polaritons in planar waveguides either made of a perovskite or based on high-index dielectric slab integrated with transition metal dichalcogenide monolayer. I will show how direct variation of radiative losses via changing the SIL-sample distance in such systems allows for the control of Rabi splitting\, and extraction of exciton-photon coupling strength along with the intrinsic properties of excitons in the sample under study. \nReferences\n1. Pidgayko\, D.\, Sinev\, I.\, Permyakov\, D.\, Sychev\, S.\, Heyroth\, F.\, Rutckaia\, V.\, Schilling J.\, Lavrinenko A.\, Bogdanov A. and Samusev\, A.\, “Direct imaging of isofrequency contours of guided modes in extremely anisotropic all-dielectric metasurface”\, ACS Photonics\, Vol. 6\, No 2\, 510-515\, 2018.\n2. Permyakov\, D. V.\, Sinev\, I. S.\, Sychev\, S. K.\, Gudovskikh\, A. S.\, Bogdanov\, A. A.\, Lavrinenko\, A. V. and Samusev\, A. K.\, “Visualization of isofrequency contours of strongly localized waveguide modes in planar dielectric structures”\, JETP Letters\, vol. 107\, No 1\, 10-14\, 2018.\n3. Permyakov\, D. V.\, Kondratiev\, V. I.\, Pidgayko\, D. A.\, Sinev\, I. S. and Samusev\, A. K.\, “Probing Optical Losses and Dispersion of Fully Guided Waves through Critical Evanescent Coupling”\, JETP Letters\, vol. 113\, No 12\, 780-786\, 2021.\n4. Kravtsov\, V.\, Khestanova\, E.\, Benimetskiy\, F. A.\, Ivanova\, T.\, Samusev\, A. K.\, Sinev\, I. S.\, Pidgayko\, D. A\, Mozharov\, A. M.\, Mukhin\, I. S.\, Lozhkin\, M. S.\, Kapitonov\, Yu. V.\, Brichkin\, A. S.\, Kulakovskii\, V. D.\, Shelykh\, I. A.\, Tartakovskii\, A.I.\, Walker\, P. M.\, Skolnick\, M. S.\, Krizhanovskii \, D. N. and Iorsh\, I. V.\, “Nonlinear polaritons in a monolayer semiconductor coupled to optical bound states in the continuum”\, Light: Science & Applications\, Vol. 9\, No. 1\, 1-8\, 2020.\n5. Li\, M.\, Sinev\, I.\, Benimetskiy\, F.\, Ivanova\, T.\, Khestanova\, E.\, Kiriushechkina\, S.\, Vakulenko\, A.\, Guddala\, S.\, Skolnick\, M.\, Menon\, V. M.\, Krizhanovskii\, D.\, Alù\, A.\, Samusev\, A. and Khanikaev\, A. B.\, “Experimental observation of topological Z2 exciton-polaritons in transition metal dichalcogenide monolayers”\, Nature communications\, Vol. 12\, No 1\, 1-10.\n6. Masharin\, M. A.\, Shahnazaryan\, V. A.\, Benimetsky\, F. A.\, Krizhanovskii\, D. N.\, Shelykh\, I. A.\, Iorsh\, I. V.\, Makarov S.V. and Samusev\, A. K.\, “Polaron-enhanced polariton nonlinearity in lead halide perovskites”\, arXiv preprint arXiv:2201.10265\, 2022 \n  \n  \nAbout The Speaker\nAnton Samusev holds the position of Assistant Professor at School of Physics and Engineering\, ITMO University\, St. Petersburg\, Russia. Since the PhD defense in 2011 at Ioffe Institute\, St. Petersburg\, Russia\, he is leading a scientific group currently comprising 3 Assistant Professors\, 4 Postdocs\, PhD\, MS and BS students. The scientific interests of the group lie at the confluence of the fields of nanooptics\, solid state and laser physics. The research topics include experimental studies of the near- and far-field properties of optically resonant nanoantennas and metasurfaces weakly or strongly coupled to 2D and 3D materials with pronounced excitonic response (transition metal dichalcogenides\, perovskites)\, dispersion engineering of optical surface waves in structured media\, phase change materials\, topological photonics\, photon emission from tunnel junctions\, single-photon emitters and others. Since 2017 Anton lectures the course “Introduction to Experimental Nanophotonics” within the “Nanophotonics and metamaterials” MS program at ITMO University. \nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09https://zoom.us/j/95581724217 \n\n \n 
URL:https://unam.bilkent.edu.tr/en/event/6648/
CATEGORIES:UNAM Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220512T133000
DTEND;TZID=Europe/Moscow:20220512T173000
DTSTAMP:20260905T155640
CREATED:20220427T131814Z
LAST-MODIFIED:20220429T072858Z
UID:6529-1652362200-1652376600@unam.bilkent.edu.tr
SUMMARY:NanoDay 2022
DESCRIPTION:  \n \nNanoDay will take place on Thursday\, May 12th this year as a hybrid event. This annual event held at Bilkent UNAM hosts the best international names in their respective fields and awards the best nano-scale visual through its NanoArt competition.  \nThis year on NanoDay\, we will be hosting two important names—Prof. Oliver Hayden from Technical University of Munich and Prof. Giulia Galla from The University of Chicago. The scientific talks will take place online via Zoom\, on May 12 at 13:30 and 15:30\, respectively. \n\nWe are happy to welcome outside participants to this event. Please register at the link below. Post-registration Zoom information will be sent to the e-mail address you provided: \nhttp://unam.bilkent.edu.tr/nanoday/ \n\nClick the link below to learn about the NanoArt competition and how to participate. The deadline for submissions is Thursday\, May 9 at 23:45. \nunam.bilkent.edu.tr/nanoday/nanoart/  \n@bilkentuniv \nNANODAY 2022 PROGRAM\n12:30 Opening with Poster Session (Unam Conference Hall)\n13:30 Prof.Oliver Hayden (online keynote speech)\n14:30 Flash Poster Presentations (online)\n15:00 Coffee Break\n15:30 Prof.Giulia Galli (online keynote speech)\n16:30 Closing and Award Announcements\n16.45 Open House \n  \nClick for registration!\nhttp://unam.bilkent.edu.tr/nanoday/\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/nanoday-2022/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220415T160000
DTEND;TZID=Europe/Moscow:20220415T170000
DTSTAMP:20260905T155640
CREATED:20220411T070735Z
LAST-MODIFIED:20220413T054859Z
UID:6459-1650038400-1650042000@unam.bilkent.edu.tr
SUMMARY:Logistic Cellular Automata
DESCRIPTION:Seymur Jahangirov\nMSN Graduate Program and UNAM \n\nImagine a system that consists of interconnected cells each having an inner state. The inner state of each cell is changed based on the inner states of a specific subset of cells according to a certain rule. This is a general definition of cellular automata. Now replace those cells with neurons and you get a model of a brain\, replace them with a space grid and you get a model of a fluid flow\, replace them with living cells and you get a model of skin cell of an ocellated lizard. This versatility of cellular automata captured imaginations of great minds including John von Neumann\, John Conway\, Stephen Wolfram and many others. \nIn this seminar\, we will present logistic extensions of cellular automata whereby a single parameter tunes the rate of change. We show several instances of deterministic phase transitions and self-organization in these systems. Finally\, we introduce the operator representation which brings clarity to dynamics of elementary cellular automata and reveals further emergent behavior in its logistic extension. \n \n  \n  \nAbout The Speaker\n  \nDr. Seymur Jahangirov graduated from Nuclear Energy Engineering at Hacettepe University. He received his M.Sc. and Ph.D. from the Material Science and Nanotechnology program at Bilkent UNAM while contributing to seminal works on theoretical prediction of two-dimensional materials. After a postdoc at the Nano-Bio Spectroscopy Group in Spain\, he joined Bilkent UNAM faculty as Assistant Professor. Dr. Jahangirov uses state-of-the-art computational tools based on the Density Functional Theory to discover novel low-dimensional materials with intriguing properties. Dr. Jahangirov is recipient of prestigious awards including Marie Curie IEF award from ERA and TÜBA-GEBİP award from Turkish Academy of Sciences. \nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n \n 
URL:https://unam.bilkent.edu.tr/en/event/logistic-cellular-automata/
CATEGORIES:UNAM PI Seminars
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/04/seymur-jahangirov.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220401T160000
DTEND;TZID=Europe/Moscow:20220401T170000
DTSTAMP:20260905T155640
CREATED:20220322T132555Z
LAST-MODIFIED:20220328T121827Z
UID:6398-1648828800-1648832400@unam.bilkent.edu.tr
SUMMARY:3D laser nanoprinting
DESCRIPTION:Prof. Martin Wegener\nKarlsruhe Institute of Technology \n\nTwo-photon based 3D laser printing routinely allows for the making of complex three-dimensional sub-micrometer and nanometer structures and has become a mature\, widespread\, and commercially available technology. After briefly reviewing the basic principle and the state-of-the-art\, I focus on recent progress in my group. This includes replacing two-photon absorption by two-step absorption. This allows for using compact and inexpensive continuous-wave laser diodes instead of femtosecond lasers. \n \n  \n  \nAbout Speaker\n  \nAfter completing his Diplom and PhD in physics at Johann Wolfgang Goethe-Universität Frankfurt (Germany) in 1986 and 1987\, respectively\, he spent two years as a postdoc at AT&T Bell Laboratories in Holmdel (U.S.A.). From 1990-1995 he was professor (C3) at Universität Dortmund (Germany)\, since 1995 he is professor (C4\, later W3) at Institute of Applied Physics of Karlsruhe Institute of Technology (KIT). Since 2001 he has a joint appointment as department head at Institute of Nanotechnology (INT) of KIT\, since 2016 he is one of three directors at INT. From 2001-2014 he was the coordinator of the DFG-Center for Functional Nanostructures (CFN) at KIT. Since 2018 he is spokesperson of the Cluster of Excellence 3D Matter Made to Order. His research interests comprise ultrafast optics\, (extreme) nonlinear optics\, optical laser lithography\, photonic crystals\, optical\, mechanical\, electronic\, and thermodynamic metamaterials\, as well as transformation physics. This research has led to various awards and honors\, among which are the Alfried Krupp von Bohlen und Halbach Research Award 1993\, the Baden-Württemberg Teaching Award 1998\, the DFG Gottfried Wilhelm Leibniz Award 2000\, the European Union René Descartes Prize 2005\, the Baden-Württemberg Research Award 2005\, the Carl Zeiss Research Award 2006\, the Hector Research Award 2008\, the SPIE Prism Award 2014 for the start-up company Nanoscribe GmbH\, the Stifterverband Science Award – Erwin-Schrödinger Prize 2016\, and the Technology Transfer Prize of the German Physical Society (DPG) 2018. In 2014\, 2015\, 2016\, 2017\, 2018\, 2020\, and 2021 Clarivate Analytics listed him as “Highly Cited Researcher” (top 1%). He is Member of Leopoldina\, the German Academy of Sciences (since 2006)\, Member of acatech\, the National Academy of Science and Engineering (since 2019)\, Member of the Hector Fellow Academy (since 2013\, presently also President)\, Fellow of the Max Plack School of Photonics (since 2019)\, Fellow of the Optical Society of America (since 2008)\, and Honorary Professor at Huazhong University of Science & Technology\, Wuhan\, China (since 2014). \nTopic: Nanocolloquium series\nTime: Mar 25\, 2022 04:00 PM Istanbul\nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09\n \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/3d-laser-nanoprinting/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/03/Martin-Wegener.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220318T160000
DTEND;TZID=Europe/Moscow:20220318T170000
DTSTAMP:20260905T155640
CREATED:20220316T111506Z
LAST-MODIFIED:20220316T111506Z
UID:6357-1647619200-1647622800@unam.bilkent.edu.tr
SUMMARY:Fibers for optics and structures
DESCRIPTION:Hasan Yılmaz\nMSN Graduate Program and UNAM \n\nOptical fibers are versatile waveguides that have numerous application areas such as telecommunication\, lasers\, biomedical and infrared (IR) optics. Hollow-core optical fibers (HCFs) are microstructured fibers with a hollow-core surrounded by cladding elements that further diversify the applications of fibers in nonlinear optics\, chemical sensing\, plasma generation and many others. The recent simplified cladding structures of HCFs have demonstrated considerable improvement on the optical performances and have the capability of outperforming the solid-core fibers. The selection of fiber’s material plays a crucial role to guide the light in the IR region. Materials such as semiconductors (Si and Ge)\, chalcogenides\, silica-based glasses and even polymers can be used for infrared light transmission by the virtue of the hollow-core and low material absorption. Furthermore\, fibers are used as structural materials within composites by forming the filler part. The body of aircrafts\, sports cars\, yacht and the blades of wind turbines are made by fiber-based composites. The usage of fibers in flexible electronics is another important field that seeks for the electrical conductivity with light-weight approaches. In our laboratory\, Contemporary Fibers Lab (CFL)\, we investigate several types of fibers for light guidance\, composites and electrical conductivity. \nIn this talk\, I will introduce the present research activities in our laboratory by briefly discussing selected present/future projects. The development of optical fibers including the modelling\, fabrication and characterization by multiple materials will cover the first part of the talk. In the second part\, I will focus on the work for improving the mechanical properties of structural fibers by the nanoparticles and flexible conductive fibers. \n \n  \n  \nAbout Speaker\nDr. Mustafa Ordu is a principal investigator in UNAM-National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology at Bilkent University. He received his B.Sc. and M.Sc. degrees in Mechanical Engineering from Istanbul Technical University\, Turkey and Tohoku University\, Japan\, respectively. He completed his Ph.D. studies at Boston University in 2018 on semiconductor-core optical fibers for infrared light guidance. He worked as a postdoctoral researcher on the topics of hollow-core optical fibers and laser micromachining of fibers at XLIM Research Institute\, France before joining Bilkent University. His research interests focus on a variety optical fibers\, particularly for applications in infrared optics. Also\, he has several research projects on glass fibers as structural materials. \nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217
URL:https://unam.bilkent.edu.tr/en/event/fibers-for-optics-and-structures/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220128T160000
DTEND;TZID=Europe/Moscow:20220128T170000
DTSTAMP:20260905T155640
CREATED:20220126T060052Z
LAST-MODIFIED:20220126T060202Z
UID:6279-1643385600-1643389200@unam.bilkent.edu.tr
SUMMARY:Towards reconfigurable digital complex photonic systems
DESCRIPTION:Hasan Yılmaz\nMSN Graduate Program and UNAM \n\nOptical waves scattered or emitted by materials carry information in temporal (spectral) or spatial domains. Perhaps\, the most prominent example of optical information is an optical image that is created by an optical microscope. With the emergence of information technology\, optical information can be digitized and computationally processed. Computational optical imaging systems typically map spatial and spectral information of light waves to the spatial properties of materials. However\, most optical materials are complex (three-dimensional and opaque): we cannot see inside or behind them. This is because opaque materials’ refractive index is inhomogeneously distributed in space. Incident light waves scatter into random directions upon propagation through opaque materials such as clouds\, mil kor biological tissue\, which scrambles the spatial information. Such a random light scattering process complicates the mapping between scattered light waves and three-dimensional structures. \nIn this talk\, first I will introduce the transmission matrix concept which maps the incident light waves to the scattered light waves through complex optical materials. The main ingredient of this talk will be the ‘transmission-matrix-based operator’ approach. I will show that the transmission matrix not only enables us to transport optical information through a complex material (e.g. a layer of white paint or multimode fiber)\, but it also enables us to modify the relationship between certain incident waves\, scattered waves\, and the configuration of the system. Our ‘transmission-matrix-based operator’ approach provides a general framework for designing and creating a desired input-output relationship of classical and quantum light waves for various applications in imaging\, metrology\, and communication through complex materials. \nFinally\, I will introduce the inverse scattering problem in complex photonic systems such as multiple-scattering materials. Benefiting from the ‘transmission-matrix-based operator’ approach\, I will briefly propose reconfigurable digital complex photonic systems. Such systems will not only be ideal hardware platforms to physically simulate inverse scattering problems but also lead to reconfigurable multimode photonic devices such as dynamic mode converters\, mode demultiplexers\, etc. \n \n  \n  \nAbout Speaker\nHasan Yılmaz is currently an assistant professor at Bilkent University\, the Institute of Materials Science and Nanotechnology. His research interests cover experimental and computational optics and photonics\, light scattering\, optical imaging and spectroscopy\, computational imaging\, wavefront shaping\, spatiotemporal control of light\, complex photonic materials\, mesoscopic physics of light\, statistical optics\, laser physics and random matrix theory. \nPreviously\, he worked as a postdoctoral associate and an associate research scientist at Prof. Hui Cao’s lab\, Yale University\, the Department of Applied Physics. He has received a Ph.D. degree from the University of Twente in the Netherlands for his thesis entitled “Advanced Optical Imaging with Scattering Lenses\,” with Prof. Allard Mosk in 2015. Before this\, he has received a M.Sc. degree in Materials Science and Engineering at Koç University\, where he worked with Prof. Ali Serpengüzel at the Microphotonics Research Laboratory. He has a B.Sc. degree in Physics Engineering from İstanbul Technical University. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/towards-reconfigurable-digital-complex-photonic-systems/
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220121T160000
DTEND;TZID=Europe/Moscow:20220121T170000
DTSTAMP:20260905T155640
CREATED:20220118T113120Z
LAST-MODIFIED:20220118T113120Z
UID:6242-1642780800-1642784400@unam.bilkent.edu.tr
SUMMARY:What can we learn from computational cell models?
DESCRIPTION:Aykut Erbaş\nMSN Graduate Program and UNAM \n\nThere are over 40 million cells in our body. Despite carrying an identical genome\, these cells are specialized into 200 different types to undertake particular biological tasks in various tissues. The main factor determining a cell’s biological identity is the type and amount of cell-specific proteins. In turn\, these cell-specific proteins somewhat determine how\, when\, where\, and which part of genetic information encoded in our DNA will be read to sustain the dynamic complexity of cellular activity. One of the questions that we ask in our research group: can we use minimal computational models to reveal certain parts of this complexity? By considering the kinetics and organizational properties of DNA-binding proteins\, in this talk\, I will present a couple of examples to convince you that computer simulations can be used\, along with biomolecular experiments\, to elucidate the dynamic and organizational properties of the genome. Together we will see that well-designed molecular models can replicate experimental findings and encourage us to reconsider even re-write certain parts of our text-books. \n \n  \n  \nAbout Speaker\nDr. Aykut Erbaş completed his Ph.D. in Physics at Technical University Munich (TUM)\, Germany\, in 2011. His Ph.D. thesis contributed to the understanding of biomolecular mobility\, specifically\, of disordered protein structures. Later he moved to the Chemistry Department at the University of North Carolina – Chapel Hill to research polymer dynamics. Between 2014 and 2018\, Dr. Erbas was a research fellow at the Material Science & Engineering Department at Northwestern University under various centers dedicated to designing bio-inspired energy systems. He also researched the interaction kinetics of biomolecular systems and molecular self-assembly in collaboration with Northwestern Biomolecular Sciences and Chemistry Departments. Dr. Erbas has been actively working on various soft-matter systems in close collaboration with experimental and engineering groups. He is currently interested in the kinetics aspects of protein-DNA interactions and 3d genome organization in his lab. Dr. Erbas has been an assistant professor at UNAM since September 2018 \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/what-can-we-learn-from-computational-cell-models/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220107T160000
DTEND;TZID=Europe/Moscow:20220107T170000
DTSTAMP:20260905T155640
CREATED:20220110T065229Z
LAST-MODIFIED:20220110T065229Z
UID:6178-1641571200-1641574800@unam.bilkent.edu.tr
SUMMARY:Fishes\, worms\, and human aging
DESCRIPTION:Ayça Arslan Ergül\nMSN Graduate Program and UNAM \n\nIn this talk I will not focus on one research\, but instead I will try to give glimpses of all the topics that we work on or ideas that we nourish. In this way you may also join or contribute to one of the projects\, if you get interested. Arslan-Ergul lab has been founded in January 2021 in UNAM\, so we are celebrating our first year. Our research interest can be summarized in one word as aging\, in several words as brain aging\, neurodegeneration\, adaptation\, genetics\, and behavior. \n \n  \nAbout Speaker\nAyça Arslan Ergül was graduated from Boğaziçi University\, department of Molecular Biology and Genetics. She did her PhD in Bilkent University Molecular Biology and Genetics department\, on liver cancer and cellular senescence. In Scotland\, Glasgow\, she worked on cell-targeted therapies. For five years\, she worked in Bilkent University UNAM\, on brain aging and new cell formations and taught for the Neuroscience program. She was nominated as Changemaker by Sabancı Foundation for running the Friends\, lets do science project as a volunteer. On her YouTube channel she is teaching molecular biology. She is living with her husband Özgür Ergül and three cats. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/fishes-worms-and-human-aging/
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211224T160000
DTEND;TZID=Europe/Moscow:20211224T170000
DTSTAMP:20260905T155640
CREATED:20211221T101709Z
LAST-MODIFIED:20211221T101709Z
UID:6149-1640361600-1640365200@unam.bilkent.edu.tr
SUMMARY:Control of Static Electricity By Light and Polymer Mechanochemistry
DESCRIPTION:Bilge Baytekin\nMSN Graduate Program and UNAM \n\nThe mechanism of static electricity generation and mitigation on insulator surfaces upon rubbing/contact is one of the few scientific questions that have remained unanswered for millennia. Static charging (tribocharging) of insulators is not just a scientific mystery – it is also a significant problem\, especially critical for various industries\, e.g.\, polymer\, pharmaceuticals\, electronics\, and space. Several methods of tribocharge mitigation exist in practice; however\, none can reach the practicality of using light in the process. Here I will present light-controlled mitigation of triboelectric charges on common polymers. The tribocharged polymers are discharged upon illumination with appropriate wavelengths of light in the presence of a mediator organic dye. Our method provides spatial and temporal control on mitigation of static charges on common polymer surfaces by a mechanism that involves photoexcitation of organic dyes\, allowing an additional ‘wavelength control’. \nMechanochemistry of organics and polymers has long been studied\, but the link between the static electricity of polymers and mechanochemistry – despite its obvious presence – is still overlooked. In this talk\, I present this chemical link and show how the mechanochemical pathways and the generated mechanospecies can be used to make composites in a green chemistry way. \n \nKonuşmacı hakkında\nBilge Baytekin is an Assistant Professor in the Chemistry Department of Bilkent University. She received her Ph.D. from Freie Universitat Berlin and pursued her postdoctoral studies (2009-2014) at Northwestern University and Harvard University. Her research interests include static electricity\, organic and polymer mechanochemistry\, smart materials\, and soft robotics. She is the recipient of the Loreal Unesco for Women in Science\, TÜBA GEBIP\, BAGEP\, Mustafa Parlar Vakfı\, TÜBİTAK Teşvik Awards\, and 2019 Rising Star Award from the Electrostatics Society of America (ESA). She likes poetry and tea. She has a lovely daughter. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/control-of-static-electricity-by-light-and-polymer-mechanochemistry/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211217T160000
DTEND;TZID=Europe/Moscow:20211217T170000
DTSTAMP:20260905T155640
CREATED:20211213T074324Z
LAST-MODIFIED:20211213T074324Z
UID:6119-1639756800-1639760400@unam.bilkent.edu.tr
SUMMARY:Plasmon-Enhanced Light-Matter Interactions at the Nanoscale
DESCRIPTION:Wonmi Ahn\nMSN Graduate Program and UNAM \n\nNoble metal nanoparticles supporting collective oscillations of conduction electrons\, i.e.\, surface plasmon resonances\, exhibit excellent light-focusing ability and high spectral sensitivity to changes in the surrounding medium. These capabilities explain the increasing role of plasmonic nanomaterials in nanoimaging\, sensing\, energy\, and biomedical applications. However\, high dissipative losses in plasmonic metals and the lack of mass-production methods have been severe bottlenecks preventing their practical use in many applications. In this seminar\, I will show some of the approaches we have taken in the past to overcome the challenges in the field of plasmonics\, which have eventually led to the development of new classes of optoplasmonic materials and bottom-up nanofabrication methods. I will also show how we exploited the dissipative plasmonic loss\, which has been a significant drawback\, to generate hot carriers that drive chemical reactions. Beyond plasmonics\, I will also discuss light-matter interactions in the strong coupling regime (for both excitonic and vibrational absorbers)\, which have great potential to modify materials’ physical and chemical properties by light. The talk will conclude with future research directions that may spark interdisciplinary collaboration within the UNAM community. \n \nKonuşmacı hakkında\nWonmi Ahn obtained a Bachelor of Engineering degree in Chemical Engineering from Soongsil University in South Korea and a Ph.D. degree in Materials Science and Engineering from the University of Utah in the United States. She undertook postdoctoral research at Boston University in the United States and continued her research at the U.S. Naval Research Laboratory as a National Research Council postdoctoral fellow of the United States and later worked as a Materials Research Scientist. She has published more than 21 research papers\, including one U.S. Patent on a nanofabrication method based on electroless metal plating technique. Her research interests include light-matter interactions in the strong coupling regime\, plasmonic nanomaterials for photocatalysis\, plasmon-enhanced photoelectrochemistry\, and photonic-plasmonic hybrid materials for sensing applications. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/plasmon-enhanced-light-matter-interactions-at-the-nanoscale/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211119T160000
DTEND;TZID=Europe/Moscow:20211119T170000
DTSTAMP:20260905T155640
CREATED:20211115T112644Z
LAST-MODIFIED:20211115T122531Z
UID:6030-1637337600-1637341200@unam.bilkent.edu.tr
SUMMARY:Exploring electronic correlations in low dimensional materials
DESCRIPTION:T. SERKAN KASIRGA\nMSN Graduate Program and UNAM \n\nStrong electronic correlations among various degrees of freedoms in solids result in the emergence of fascinating phenomena. To name a few we can list metal-insulator transitions\, charge density wave transitions and superconductivity. However\, these phenomena are notoriously difficult to study experimentally as they are typically associated with phase transitions that are extremely sensitive to the defects and impurities in the materials. In this talk\, I will present our efforts to understand the phase transitions in some exemplary materials and present a journey from materials synthesis to characterization of the properties via electrical\, mechanical and optical methods. First\, I will talk about how we synthesize the materials in a unique setup that allows real-time optical observation of the crystal synthesis. Then\, I will talk about the effect of thickness on the phase transitions and how we use light to measure certain properties of the correlated materials. Overall\, I will try to give a general perspective on our efforts and conclude with open questions. \n \nAbout The Speaker\nDr. Kasırga got his bachelor’s degree from Bilkent University in physics in 2009. Then\, he moved to the University of Washington\, Seattle for his Ph.D. in physics. After completing his Ph.D. in 2013\, he moved to Bilkent University as a principal investigator at the National Nanotechnology Research Center (UNAM) and established a research program. Since 2015\, he has been serving as the associate director of UNAM and since 2016 he is co-affiliated with the department of physics. His research has appeared in prestigious journals in his field such as Nature\, Nature Nanotechnology\, Nano Letters and 2D Materials. For these research efforts\, the Academy of Science awarded him the Young Scientist Award (GEBİP) in 2021. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/exploring-electronic-correlations-in-low-dimensional-materials/
CATEGORIES:UNAM PI Seminars
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2021/11/t-serkan-kasirga.jpg
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DTSTART;TZID=Europe/Moscow:20211112T160000
DTEND;TZID=Europe/Moscow:20211112T170000
DTSTAMP:20260905T155640
CREATED:20211115T122209Z
LAST-MODIFIED:20211115T132854Z
UID:6052-1636732800-1636736400@unam.bilkent.edu.tr
SUMMARY:How does self-organization reduce entropy?
DESCRIPTION:ÖMER İLDAY\nMSN Graduate Program and UNAM \n\nSelf-organization is the spontaneous emergence of an ordered state. Despite its ubiquity\, how self-organization reduces entropy was never clarified. In this talk\, we present a new theoretical framework\, whereby we decompose a self-organized system into two parts\, one that gets ordered and another that reduces the entropy of the former by mutual information generated through a feedback process. We show that the combined system simply evolves to higher total entropy\, which inadvertently reduces the entropy of the organized part. \nSelf-organization is notoriously difficult to direct to a specific pattern. Our new framework suggests a route. We need to ensure that the desired pattern has higher feedback gain than the competing ones. We also introduce stimulated symmetry breaking as means to reshape the feedback gain landscape. As a proof of concept\, we experimentally demonstrate directing a self-organization process\, namely\, nonlinear laser lithography\, to create all 2D Bravais lattices. \n \n  \nAbout The Speaker\nDr. F. Ömer Ilday studied theoretical physics at Boğaziçi University\, Istanbul\, Turkey\, graduating valedictorian in 1998. He took his Ph.D. in applied physics from Cornell University\, USA\, in 2003. He worked at MIT from 2003 to 2006. In 2006\, he joined Bilkent University as a faculty member. He was awarded the European Research Council’s prestigious Consolidator Grant in 2013\, the first ERC grant on basic science in Turkey\, and the ERC Proof of Concept Grant in 2021. He has published ten articles in Nature\, Nature Photonics\, Nature Physics\, and Nature Communications. His contributions to science have been generously recognized through the Findlay Award\, TÜBA-GEBIP Award\, Teşvik Award (TÜBİTAK)\, Engin Arık Science Award from the Turkish Physical Society\, and the top award in science in Turkey\, the Science Award of TÜBİTAK. He has been elected as a member of the Science Academy of Turkey and Academia Europaea. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217
URL:https://unam.bilkent.edu.tr/en/event/how-does-self-organization-reduce-entropy/
CATEGORIES:UNAM PI Seminars
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2021/11/omer-ilday.jpg
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