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DTSTART;TZID=Europe/Moscow:20221007T160000
DTEND;TZID=Europe/Moscow:20221007T170000
DTSTAMP:20260905T151708
CREATED:20220928T063521Z
LAST-MODIFIED:20220928T063553Z
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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
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/09/Q-Han-Park.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220401T160000
DTEND;TZID=Europe/Moscow:20220401T170000
DTSTAMP:20260905T151708
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
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