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X-WR-CALDESC:Events for UNAM Nanoteknoloji Araştırma Merkezi
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DTSTART;TZID=Europe/Moscow:20250616T154000
DTEND;TZID=Europe/Moscow:20250616T170000
DTSTAMP:20260906T004317
CREATED:20250612T055520Z
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UID:9884-1750088400-1750093200@unam.bilkent.edu.tr
SUMMARY:Smart Self-assembly for Sustainable Nanophotonics and Optoelectronics
DESCRIPTION:Talha Erdem\nAbdullah Gül University \n\nReducing the greenhouse gas emissions have already been accepted as the straightforward way to limit the environmental effects of the global warming. Toward this aim\, significant efforts have been put forward in the field of photonics as well. For example\, solar energy became a significant source of energy and light-emitting diodes promising a lower energy consumption became the main devices used lighting applications. However\, the widespread use of these technologies has a cost: the dependence on rare earth elements. As part of the efforts to eliminate this dependence\, our group works on the utilization of colloidal nanoparticles to produce nanophotonic structures and optoelectronic devices using controllable self-assembly methods\, i.e.\, smart self-assembly. \nIn this talk\, we will first discuss our work where we tailored the electrostatic self-assembly of colloidal quantum dots on 2D surfaces using light [1]. Owing to the local heating due to laser irradiation\, the quantum dots gain enough kinetic energy such that they can escape the electrostatic attraction. This approach allowed us to produce patterns having 100s of micrometers by a few centimeters. Next\, we will present the opportunities that the light-assisted local heating offers for DNA-driven self-assembly. Within this framework\, we will first explain our results on tailoring the optical transmission of the self-assembled networks made of DNA-functionalized gold nanoparticles [2]. Subsequently\, we will continue with the control of 2D self-assembly of DNA-functionalized quantum dots as part of our efforts towards developing novel fabrication technologies [3]. We will then talk about our novel photodetector application made of the DNA-functionalized metal and semiconductor nanoparticles. Owing to DNA-DNA interaction\, these photodetectors exhibit a negative responsivity [4]. Next\, we will present our work in which we explored how to customise the optical polarization of magnetic and self-assembled quantum dot supraparticles [5]. We report on our efforts to produce CdSe/ZnS quantum dots\, iron oxide nanoparticles\, and silver nanoparticle supraparticles. We then demonstrate the magnetic field-dependent optical polarization control of the quantum dot-iron oxide supraparticle network. Finally\, we will present the formation of translucent photonic crystals of latex nanoparticles [6]. These particles form 3D photonic crystals when they are concentrated. Their reflection colors can be easily tailored by changing the final concentration of the material as controlling the concentration enables controlling the distance between the particles forming the photonic crystal. \nReferences\n[1] Akrema et al.\, J. Phys. Chem C. 129\, 9747 (2025).\n[2] Z. Senel et al.\, J. Appl. Phys. Vol. 129\, 153106 (2021).\n[3] Z. Senel et al.\, arXiv:2307.10241 (2023); Z. Senel and E. Taze et al.\, in submission.\n[4] M. Savas et al.\, in submission.\n[5] T. Erdem et al.\, MRS Bulletin 47\, 1084 (2022).\n[2] T. Erdem et al.\, Frontiers in Physics 10\, 847142 (2022). \n  \nAbout Speaker\nAsst. Prof. Talha Erdem received his BS\, MS\, and PhD degrees all in Electrical-Electronics Engineering from Bilkent University in Türkiye in 2009\, 2011\, and 2016\, respectively. His graduate studies focused on the development of efficient and stable quantum dot color converters for high-quality light-emitting didoes. His works led to the SPIE’s Scholarship in Optics and Photonics in 2012 and IEEE Photonics Society Graduate Student Fellowship in 2016. After his PhD\, he was awarded the Newton International Fellowship by the Royal Society to conduct his research at the Cavendish Laboratory\, University of Cambridge. During this period\, he focused on the utilization of various self-assembly tools in photonic applications. In 2019\, he moved to Abdullah Gül University and established the Smart Nanophotonics Research Group. His current research interests are the development of novel optoelectronic devices and novel fabrication technologies using smart self-assembly of nanoparticles. In 2023\, his research was acknowledged by the Science Academy (Bilim Akademisi) with BAGEP Awards and also by the Turkish Academy of Science (TÜBA) with GEBİP young investigator awards.
URL:https://unam.bilkent.edu.tr/en/event/smart-self-assembly-for-sustainable-nanophotonics-and-optoelectronics/
CATEGORIES:UNAM Seminars
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