visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

2020 가을학기 광학분야 특별세미나

2020.11.10 08:21

admin 조회 수:1286

장소 E6-2 1323 
일시 Nov. 12 (Thu.) 4:00 PM 
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 일시 장소 연사 제목
360 2015/10/23, 3PM  E6-2, #5318  Dr. Helmut Soltner (Forschungszentrum Juelich)  Development of a Rogowski Coil as a new beam position monitor
359 2015/10/23-12/4 10:30 AM  E6, #1501  Prof. YongKeun Park & Prof. Tae-Young Yoon  How to write a good scientific paper[Open lecture series]
358 2015/11/06, 4:30 PM  E6-2, #5318  Dr. Youngkuk Kim (University of Pennsylvania)  Topological Dirac line nodes in centrosymmetric semimetals
357 2015/11/10, 4PM  E6-2, #1323  Dr. Woosuk Bang (Physics division, Los Alamos National Laboratory)  Rapid heating of matter using high power lasers
356 2015/11/19, 4PM  E6-2, #1323  Dr. Daesu Lee (University of Wisconsin-Madison)  Emergent Collective Phenomena and Functions at Reduced Dimensions
355 2015/11/23, 1:30PM  E6-2, #1323  Dr. Michael Park (Stanford University)  What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
354 2015/11/24, 4PM  E6-2, #1323  Dr. Kab-Jin Kim (Institute for Chemical Research, Kyoto University, Japan)  Topology-based understanding of spin dynamics in inhomogeneously magnetized systems
353 2015/11/28, 10AM  E6-2, #1323  Dr. Suyong Jung (Korea Research Institute of Standards and Science)  Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
352 2015/12/01, 4PM  E6-2, #1323  Dr. Yeong Kwan Kim(Lawrence Berkeley National Laboratory, USA)  Introducing extra dimensions to spectroscopic studies of advanced quantum materials
351 2015/12/02, 4PM  E6-2, #1323  Dr. Dae-Jeong Kim (Dept. of Physics and Astronomy, University of California, Irvine)  Samarium Hexaboride: Is it a Topological insulator?
350 2015/12/03, 4PM  E6-2, #1323  Dr. Sang-Yun Lee (3rd institute of Physics, University of Stuttgart, Germany)  Hybrid solid state spin qubits in wide bandgap semiconductors
349 2015/12/09, 11AM  E4(KI Building), Connect room (2nd fl.)  Arjun G. Yodh (University of Pennsylvania)  Functional Imaging & Monitoring of Brain & Breast with Diffuse Light
348 2015/12/09, 2PM  E6-2, #1323  Arjun G. Yodh (University of Pennsylvania)  SWELLABLE COLLOIDAL PARTICLES ARE SWELL
347 2015/12/11, 1:30PM  E6-2, #1323  Dr. KwangYong Choi  (Chung-Ang University)  Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
346 2015/12/11, 3:45PM  E6-2, #1323  Dr. Ji Hun Sim (POSTECH)  Dynamical mean field theory studies on heavy fermion system
345 2015/12/17, 11:00AM  E4(KI Building), Matrix Hall (2nd fl.)  Dr. Jung-Hoon Park (Purdue University)  Wavefront engineering for in-vivo Deep brain imaging
344 2016/03/07-06/13  E6, 1501  Prof. David Helfman(KAIST) 외  Physics Colloquium : 2016 Spring file
343 2016/03/11 1:30 PM  E6-2. 1st fl. #1501  Dr. Kwon Park  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
342 2016/03/11 4 PM  E6-2. 1st fl. #1501  Dr. Tae-Hwan KIM (POSTECH)  Jan. Switching handedness of of chiral solitons in Z4 topological insulators
341 2016/03/11-06/09  E6-2, 1501 외  박권(KAIS) 외  Physics Seminar Serises : 2016 Spring file