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OEQELAB, Seoul National University

NCRCAPAS, Seoul National University

제 목 Electronically Tunable Mid-infrared Light Manipulation and Generation using Graphene Plasmons

강 사 김세윤 박사 (University of Wisconsin-Madison, USA)

시 간 2020년 2월 11일 (화요일) 오전 11시

장 소 제1신공학관 301동 1112호

 

Abstract

Graphene is a monolayer of carbon atoms constructing a two-dimensional honeycomb structure, and it has an excellent carrier mobility and a very high thermal conductivity. Recently, graphene based optical modulators and phase shifters have emerged as an area of intense research partly due to the ability of confined graphene plasmonic resonances to create a strong electrostatic response at THz to mid-IR frequencies. Additionally, the high confinement factor of graphene plasmons allow for the creation of highly miniaturize and active optical elements. Despite these capabilities, the poor radiative coupling to graphene plasmonic nanoresonators and low graphene carrier mobilities from imperfections in processed graphene samples have led to low light modulation depths in experimental attempts at creating tunable light modulation in graphene devices. In this talk, I will present multi-scale nanophotonic structure strategies to efficiently manipulate mid-infrared light using graphene plasmonic nanoresonators. Here, noble metal plasmonic structures are incorporated to significantly enhance light-matter interactions in graphene as well as to bridge a large wavelength mismatch between free-space photons and graphene plasmons confined in deep-subwavelength-scale. The proposed strategy allowed experimental demonstration of electronically tunable perfect absorption in graphene, large modulation efficiencies in transmission, and complete complex amplitude modulation. In addition to the manipulation of mid-infrared light, I will discuss experimental observation of hot-plasmon-mediated mid-infrared light generation in graphene, which can be utilized for bright mid-infrared light sources.

 

Biography

Seyoon Kim received his B.S. degree and M.S. degree in electrical engineering from Seoul National University in 2005 and in 2007, respectively. He was a researcher at Agency for Defense Development from 2007 to 2008 and at Seoul National University from 2008 to 2010. After receiving his Ph. D. degree from California Institute of Technology in 2016, he worked as a postdoctoral researcher at California Institute of Technology and at ICFO in Spain from 2017 to 2018. Currently, he is an assistant scientist in University of Wisconsin-Madison. His research interests include graphene plasmonic light modulators and metasurfaces.

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