korean english


Home > 게시판 > 세미나

아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.

4시 20분부터 제1과학관 31214 e+강의실에서 간단한 다과를 제공합니다.

아 래

Title: Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope

Speaker: 장   기   석  박사님 (LG Display)

Date & Time: Mar. 27. (Wed.) 2019 4:30 PM

Place: Natural Science 1,  Room No. 31214

Abstract: Making a ‘molecular movie’ is Holy Grail to directly visualize structural phase transitions among metal, insulator and superconductor and photo-induced non-thermal energy transfer processes. To achieve this, an ‘ultrafast camera’ with simultaneously high spatial and temporal resolution to catch the atomic dynamics is required. The pump-probe technique based on femtosecond pump laser with a electron pulse probe can provide a basic framework for realizing such an ‘ultrafast camera’ although this technology has not achieved its full utility as a universal imaging and spectroscopy tool, due to limitations in generation and preservation of a high–brightness electron beam in the ultrafast regime. To realize the high-brightness electron pulse, the major challenge is overcoming strong Coulomb repulsion among electrons (space-charge effect) in the pulse, because the space–charge effect causes the electron pulse expansion in transverse and longitudinal direction. In this seminar, the high-brightness ultrafast electron beam physics will be introduced with the major components, (1) photoelectron gun, (2) magnetic lenses, and (3) an RF compressor controlling the space-charge effect along transverse and longitudinal direction respectively, and the previous studies about photo-induced surface charge dynamics and structural phase transition in graphene and VO2 will be presented.

번호 제목 날짜 조회 수
공지 2022학년도 1학기 콜로퀴움 일정 2022.01.10 1795
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 813302
255 <Nov. 11(Wed.) 4:30 PM> 그래핀 산업의 현황과 전망 2015.11.09 57651
254 <10/29(수)> 창조경제와 과학기술혁신시스템 2014.10.16 57840
253 <4/15(수) 오후4:30분> Who is SHE? 2015.04.08 58067
252 <10/15(수)> 첨단 과학 기술의 세계와 물리학의 위상 2014.10.08 58308
251 <May. 11(Wed.) 4:30 PM> In-situ x-ray studies of functional oxides for energy systems 2016.05.23 58381
250 <March. 16(Wed.) 4:30 PM> 초고속반도체의 블랙다이아몬드™,low-k 2016.03.10 58426
249 <5/20(수) 오후4:30분> Nonequilibrium statistical physics for Brownian heat engine 2015.05.14 58735
248 <9/24(수)> Design Principles of Cellular Networks 2014.09.18 58801
247 <9/17(수)> Reshaping Micro/Nanophotonics by Programmable Soft-Matter 2014.09.15 59002
246 <Sep. 27(Wed.) 4:30 PM> Triboelectric and Piezoelectric Nanogenerators for Self-Powered Electronics 2017.09.20 59217
245 <11/5(수)> 안전한 사회를 위한 과학의 역할 2014.11.01 59357
244 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 59452
243 <3/18(수) 오후4:30분> 시장리스크 관리(Market Risk Management) 소개 2015.03.11 59542
242 <10/30> 광섬유 센서 2013.10.17 59831
241 <4/8(수) 오후4:30분> 우라늄의 일생 2015.04.02 60509
» <Mar.27(Wed.)> Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope 2019.03.20 60643
239 <11/20> 마침내 발견된 신의 입자: 힉스 보존 2013.11.14 60680
238 <11/26(수)> Neutrino Physics with KamLAND 2014.11.20 60950
237 <Oct. 14(Wed.) 4:30 PM> 국방과학기술과 물리학 2015.10.07 61068
236 <10/2> What's the matter? 2013.09.26 61471