visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

2020 가을학기 광학분야 특별세미나

2020.11.10 08:21

admin 조회 수:1625

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
506 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
505 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
504 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file
503 2014-05-28 17:00  KI Building, Matrix Hall  부품소재산업이 미래다
502 2014-12-22 14:00  E6, Rm1319  Dynamics of molecular motors: Power stroke vs Brownian ratchet file
501 2015-03-04 12:00  1323호, E6-2  Bioimaging and Biosensing Using Near-Infrared Fluorescence file
500 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
499 2015-03-13 14:00  Connect Room, KI Bldg.  The 15th Innovative Workshop on Soft/Bio Materials file
498 2015-06-03 12:00  Room 101, E11  The First Wednesday Multidisciplinary Forum file
497 2015-07-15 14:00  E6-2,1323  Electronic and optical properties of titanate-based oxide superlattices
496 2015-07-16 16:00  E6-2, 1318  Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
495 2015-07-16 16:00  E6-2, 1501  KAIST Physics Distinguished Lecture
494 2015-07-23 13:30  E4, B401  Enhanced ZnO based UV photonics and related applications file
493 2015-08-03 10:30  E6-2, #1323 (Seminar Room)  Axion Search
492 2015-08-04 11:00  B501, Room Red, KI bldg. 5nd fl.  Propagation of ultrasound through two- and three-dimensional strongly scattering media
491 2015-09-07 15:00  E6-2. 1st fl. #1318  Advanced Optical Materials and Devices at NRL
490 2015-09-07 16:00  E6, 1501  Physics Colloquium : 2015 Fall file
489 2015-09-14 14:00  E6-2. 2nd fl. #2501  Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
488 2015-09-15 16:00  E6, 1501  Physics Colloquium : 2014 Fall file
487 2015-10-14 18:00  KAIST Munji Campus Supex Hall  인터스텔라 영화 속의 물리 file