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세미나 [08/10] Nanostructured on-chip photonics with all-dielectric metamaterials and concentric microresonators
작성일
2018.08.06
작성자
전기전자공학부
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< BK21 플러스 BEST 정보기술 사업단 세미나 개최 안내> 


개최일시 : 2018 년 8 월 10 일 금요일 11:00 ~ 12:00

개최장소 : 제 2공학관 B701호

세미나 제목 : Nanostructured on-chip photonics with all-dielectric metamaterials and concentric microresonators

발표 초록 :

Chip-scale photonic devices can miniaturize a bulk optical system into a single tiny chip, confining light down to hundreds of nanometer-scale waveguide cross-sections and enhancing the light-matter interaction; this has revolutionized the fundamental research in nonlinear/quantum photonics. In addition, a compact, chip-scale device size allows the use of photonic systems outside of the laboratory for a broad range of applications in high-speed optical communication, biochemical sensing, high-precision spectroscopy, light detection and ranging (LIDAR), etc. In such applications, realizing a high-density photonic chip integration is highly desirable, as more building blocks provide more functionalities on a single chip (analogous to electronics). However, current approaches of light confinement simply rely on the index-contrast of core and cladding materials and the wave nature of light (e.g., waveguide crosstalk) limits the photonic integration density.

In this talk, I will review our efforts in developing novel photonic devices: 1) high-density photonic chip integration with all-dielectric metamaterials [1] and 2) on-chip microcomb generation with dispersion-engineered concentric microresonators [2]. First, I will present a new class of waveguide scheme, i.e., an extreme skin-depth (e-skid) waveguide, whose evanescent waves are suppressed by highly anisotropic all-dielectric metamaterials. The waveguide crosstalk and bending loss are reduced significantly, enabling a dense integration of optical waveguides. Next, concerning the frequency comb research, I will present a concentric microresonator that can engineer the resonator dispersions significantly. Strong anomalous dispersion has been demonstrated in a thin silicon nitride film which was previously thought to have high normal dispersion. Together with a mode-selective, tapered coupling scheme, coherent frequency combs and soliton pulses have been generated. Finally, I will briefly describe a photonic to free-space extreme mode converter for the integration of photonic chips with other systems, e.g., atomic vapor cell cavities



강연자 성함&직함 / 소속 : 김상식 교수 / Texas Tech University, United States

초청자 : 전기전자공학과 교수 최우영