2020 가을학기 광학분야 특별세미나
2020.11.10 08:21
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
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
220 | Feb. 2(Tue) 2:30 PM | Zoom | Prof. Sangsik Kim (Texas Tech University, USA) |
Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems)
![]() |
219 | Feb. 25 - Jun 3 | Rm. 1501 (E6) |
Spring 2019: Physics Colloquium
![]() | |
218 | Feb.15(Mon), 05:00PM | Zoom | Yoshichika Otani(Tokyo Univ.) |
Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets
![]() |
217 | Feb.17(Wed)~19(Fri), 09:00~11:00AM | Online | Prof. Subir Sachdev (Harvard University) |
석학 대중 강연 및 강의 시리즈
![]() |
216 | February 12(Web.) | E6-2, #5318 | Prof. Kunio Kaneta |
From inflation to new weak-scale
![]() |
215 | February 13th (Thur.), 16:30 PM | E6-6, #119 | Dr. Seyoon Kim(University of Wisconsin-Madison) |
Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures
![]() |
214 | February 20 (Thu), 4:00 PM | #1323, E6-2 | Seunghyun Khim |
Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2
![]() |
213 | February 21 (Thu.), 16:00 PM | #5313, E6-2 | Prof. Diptimoy Ghosh |
B-meson charged current anomalies - Theoretical status
![]() |
212 | Jan 12th (Wed), 11:00 AM | Zoom and E6 #1323 | Joonseok Hur (MIT) |
Spectroscopic study of trapped ions towards probing dark matter and new physics
![]() |
211 | Jan. 11th(Tue), 15:00 | E6 #1501 | Soyeun Kim(UIUC) |
Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I
![]() |
210 | Jan. 17(Mon) - 21 (Fri), 2-4pm | E6-2 Room 2502 | Dr. Donghui Jeong (Penn State University) |
Five Lectures on Observational Probes of Dark Energy
![]() |
209 | Jan. 18(Tue), 2pm-3pm | KI bldg. 5th fl. Room B501 & Zoom | YoungJu Jo (Stanford University) |
Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo
![]() |
208 | Jan. 25th (Tue), 15:00 | E6 #1501/online | Junhyun Lee (Rutgers, the State University of New Jersey) |
Emulating twisted double bilayer graphene with a multiorbital optical lattice
![]() |
207 | Jan. 26th (Tue), 13:00 | E6 #1501 | Dr. Hyojin Jung (NIMS) |
An Introduction to Cohomology groups
![]() |
206 | JAN. 7 (Mon), 03:00 PM | E6-2. 2st fl. #2501 | Dr. Byoung min Kang |
Many-Body Invariants for Multipoles in Higher-Order Topological Insulators
![]() |
205 | Jan.28(Thu), 03:00PM | Zoom | Yaroslav Tserkovnyak (UCLA) |
Topological Transport of Deconfined Hedgehogs in Magnets
![]() |
204 | Jan.28(Thu), 06:00PM | Online Seminar | Alexandre Zagoskin(Loughborough Univ.) |
Quantum metamaterials: concept, theory, prototypes and possible applications
![]() |
203 | Jan.9 (Wed.), 04:00 PM | E6-2. 2nd fl. #2501 | Dr. Heung-Sik Kim |
Molecular Mott state in the deficient spinel GaV4S8
![]() |
202 | January 17 (Fri), 4:00 PM | #1323, E6-2 | Hiroki Ikegami |
Symmetry Breaking and Topology in Superfluid 3He
![]() |
201 | January 23, 2019 | Rm. C303, Creation Hall (3F), Munji Campus | Mikko Mottonen |
Ultrasensitive Microwave Bolometer: Opportunity for Axion Detectors
![]() |