Speaker-Coskun Kocabas

Coskun Kocabas
Bilkent University, Department of Physics,Turkey

Coskun Kocabas received the BS degree in physics from METU, Ankara, Turkey, in 2001. He took his PhD from University of Illinois at Urbana-Champaign, IL, USA, in 2007. After taking his PhD, he worked as a postdoc in Department of Chemistry and Chemical Biology at Harvard University from 2007 to 2009. In 2009, he joined Bilkent University Department of Physics as faculty member. His research group is working on synthesis of new quantum materials and their integration in to electronic and photonic devices. He is particularly interested in graphene for tunable light-matter interaction in broad spectrum from visible to microwave frequencies.

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Abstract

In nature, adaptive coloration has been used for concealment and signaling. Various biological mechanisms have evolved to tune the reflectivity of visible and ultraviolet light. In modern technology, however, there are limited number of active materials that can be used to develop surfaces with reconfigurable reflectance and transmittance in a very broad spectral window. Graphene provides new perspective for “smart” surfaces which can enable new technologies such as active radar shields to conceal objects from radar detection or flexible display devices for optical camouflage. The ability to control interaction of electromagnetic waves with matter forms the heart of these emerging applications.

In this talk, I will summarize our recent work on graphene based adaptive surfaces operating in a very broad spectrum covering from the visible to microwave. Our method relies on electro-modulation of interband and intraband electronic transition of large area single and multilayer graphene in various device architectures. Based on this principle, we developed new class of adaptive surfaces capable of real time electrical-control of its appearance (Figure 1). I will also talk about integration of possible feedback systems which allow us to realize adaptive camouflage systems that can sense the time-varying background and change the appearance to bend itself in the background.

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E-mail: meeting@c-gia.org

Abstract: Minyang Lu

Sponsor: Wenyang Yang

Media: Xiaoyan Zhang

Visa: Xiaoqing Huang

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