visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

2020 가을학기 광학분야 특별세미나

2020.11.10 08:21

admin 조회 수:1628

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
284 2023-11-23 16:00  E6-2(Natural Science B/D). 1st fl. #1323  Deciphering the Enigma of Quantum Materials by X-ray Scattering and Spectroscopy
283 2023-11-16 16:00  E6-2(Natural Science B/D). 1st fl. #1323  Electric-field control of emergent phenomena in correlated oxide thin films
282 2023-11-09 16:00  E6-2(Natural Science B/D). 1st fl. #1323  Assessing the Capability of Near-Term Photonic Devices Towards Quantum Supremacy
281 2016-09-02 14:30  E6-2(1st fl.), #1323  Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
280 2016-09-02 16:00  E6-2(1st fl) #1323  Quantum Electrical Transport in Topological Insulator Nanowires
279 2022-01-17 14:00  E6-2 Room 2502  Five Lectures on Observational Probes of Dark Energy file
» 2020-11-12 16:00  E6-2 1323  2020 가을학기 광학분야 특별세미나
277 2024-03-13 16:00  E6-2 #2502  [High-Energy Theory Seminar] The Schwarzschild Black Hole from Perturbation Theory to all Orders
276 2024-03-20 16:00  E6-2 #2502  [High-Energy Theory Seminar] Black hole states at finite N
275 2022-10-26 10:00  E6-2 #2502  Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene
274 2022-08-08 14:00  E6-2 #2502  Classical Shadow Tomography for Analog Quantum Simulators
273 2023-07-14 11:00  E6-2 #1501  Interfaces engineering of thin film oxides
272 2016-09-29 16:00  E6-2 #1323 (1st floor)  Large-scale Silicon Photonic MEMS Switches
271 2022-11-24 16:00  E6-2 #1323 & Zoom  Probing fundamental physics by mapping the mm and sub-mm sky
270 2023-03-16 16:00  E6-2 #1323  (광학분야 세미나) Investigation of 3D cell mechanics using refractive-index tomography
269 2023-01-09 16:00  E6-2 #1323  Non-Hermitian Hopf-bundle Matter. Moon Jip Park (IBS-PCS)
268 2023-01-10 16:00  E6-2 #1323  Terahertz Spectroscopy of Quantum Materials, Jae Hoon Kim (Yonsei University)
267 2023-03-24 11:00  E6-2 #1323  (응집물리 세미나)Floquet simulators of topological surface states in isolation
266 2023-04-06 16:00  E6-2 #1323  (광학분야 세미나)Nanophotonics-based approaches to explore Berry physics
265 2022-11-03 13:00  E6-2 #1323  [High-Energy Theory Seminar] Supersymmetric observables via Fermi-gas method