visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

2020 가을학기 광학분야 특별세미나

2020.11.10 08:21

admin 조회 수:6761

날짜 2020-11-12 16:00 
연사  
장소 E6-2 1323 

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 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
594 2015-07-16 16:00    Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
593 2015-07-16 16:00    KAIST Physics Distinguished Lecture
592 2015-07-23 13:30    Enhanced ZnO based UV photonics and related applications file
591 2015-08-03 10:30    Axion Search
590 2015-08-04 11:00    Propagation of ultrasound through two- and three-dimensional strongly scattering media
589 2015-09-07 15:00    Advanced Optical Materials and Devices at NRL
588 2015-09-07 16:00    Physics Colloquium : 2015 Fall file
587 2015-09-14 14:00    Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
586 2015-09-15 16:00    Physics Colloquium : 2014 Fall file
585 2015-10-14 18:00    인터스텔라 영화 속의 물리 file
584 2015-10-15 10:00    Development of Large-Bore, High Field Magnets at the NHMFL
583 2015-10-16 15:00    High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
582 2015-10-16 16:00    Fluctuations of entropy production in partially masked electric circuits
581 2015-10-23 10:30    How to write a good scientific paper[Open lecture series]
580 2015-10-23 15:00    Development of a Rogowski Coil as a new beam position monitor
579 2015-11-06 16:30    Topological Dirac line nodes in centrosymmetric semimetals
578 2015-11-10 16:00    Rapid heating of matter using high power lasers
577 2015-11-19 16:00    Emergent Collective Phenomena and Functions at Reduced Dimensions
576 2015-11-23 13:30    What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
575 2015-11-24 16:00    Topology-based understanding of spin dynamics in inhomogeneously magnetized systems