visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

2020 가을학기 광학분야 특별세미나

2020.11.10 08:21

admin 조회 수:1623

날짜 2020-11-12 16:00 
일시 Nov. 12 (Thu.) 4:00 PM 
장소 E6-2 1323 
연사 김영덕 (Young Duck Kim) 교수 

Title: Two-dimensional van der Waals Heterostructures for Next-generation Light Source

 

Speaker: (Department of Physics, Kyung Hee University) 교수님 (Young Duck Kim) 김영덕

 

Place: E6-2 1323

(Available seats are very limited.Please enroll your information in this link to get access:   https://forms.gle/rZv77u2dsptVMZuy6 )

 

Online address (zoom): https://kaist.zoom.us/j/93997220310

 

Date: 4pm, 11/12

 

Abstract

Two-dimensional (2D) van der Waals materials including graphene, hexagonal boron nitride (hBN) and transition metal dichalcogenides (TMDCs) such as MoS2 and WSe2 have great potential for exploring the exotic quantum behaviors and realization of advanced optoelectronics devices. Especially, ultrafast light emitter in nanoscale is a critical component in the development of the high bandwidth on-chip optical interconnects. However, previous technology faces the major challenges such as big footprint, high cost integration and difficulties of direct high speed electrical pumping. Here, I will talk the first electrically driven ultrafast graphene light emitter that exhibits the ultrafast light modulation up to ~ 10 GHz with broad spectral range (visible to near infrared). Atomically thin hBN encapsulation layers to graphene allow the stable and practical high performance even under the ambient condition as well as efficient direct electronic cooling via near-field coupling of hybrid plasmon-phonon polaritonic modes. Ultrafast and broadband graphene light emitter paves the way towards the realization of complete graphene-based ultrafast optical communications.  I will also present the near UV (~390nm) electroluminescence (EL) and broadband photodetection from hBN heterostructures. Near UV EL in hBN are attributed to the electric field induced artificial color centers, which are vacancy-related defects with an excitonic mode in the intrinsic band gap of hBN (> 6 eV). These results demonstrate the promise of hBN-based van der Waals heterostructures for light sources and optoelectronics in the near UV to the visible regime. 

 

주관: 라영식 교수

번호 날짜 장소 제목
345 2018-10-04 16:00  #1323, E6-2  Engineering light absorption in an ultrathin semiconductor metafilm file
344 2018-10-11 16:00  #1323, E6-2  Dirac electrons in a graphene quasicrystal file
343 2018-10-12 14:30  E6-2. 1st fl. #1323  Quantum Advantage in Learning Parity with Noise file
342 2018-10-12 16:00  E6-2. 1st fl. #1323  Direct observation of a two-dimensional hole gas at oxide interfaces file
341 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file
340 2018-10-16 10:00  #1323, E6-2  Capturing protein cluster dynamics and gene expression output in live cells file
339 2018-10-18 10:00  #1323, E6-2  Understanding membrane protein folding using single-molecule force techniques file
338 2018-10-18 16:00  #1323, E6-2  Applications of nonlinear optics for condensed matter researches file
337 2018-10-19 10:00  #1323, E6-2  Energy conversion processes during magnetic reconnection in a laboratory plasma file
336 2018-10-24 10:30  E6-1, Lecture Room 1501(1F)  Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers file
335 2018-10-25 16:00  #1323, E6-2  Abelian and non-Abelian dark photons file
334 2018-10-26 16:00  #1323, E6-2  Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
333 2018-11-01 16:00  #1323, E6-2  Direct holography from a single snapshot file
332 2018-11-08 16:00  #1323, E6-2  Conformality lost file
331 2018-11-09 14:30  E6-2. 1st fl. #1323  Moiré superlattices – from twisted bilayer graphene to quasicrystal file
330 2018-11-09 16:00  E6-2. 1st fl. #1323  Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
329 2018-11-21 15:00  #1323, E6-2  Engineering topological quantum physics at the atomic scale file
328 2018-11-22 15:00  E6 Room(#1323)  Experimental and Computational Study on Physical Properties based on Granular System file
327 2018-11-23 15:00  E6-2. 2st fl. #2501  Entanglement string and Spin Liquid with Holographic duality file
326 2018-11-29 16:00  #1323, E6-2  양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file