logo

korean english

게시판

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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1016514
206 <10/9> 금속 단결정 물성과 자성 반도체 연구 2009.10.06 75009
205 <4/17>고온초전도 2세대 선재 : 현황 및 전망 2009.05.06 75126
204 <3/21> Advanced Quantum Beams Based on Electron Accelerators and Lasers 2008.03.14 75134
203 <11/21>Super B factory @ KEK 2008.11.19 75138
202 <3/27> Proximity effects and low dimensional superconductivity of Pb nano-islands  2013.03.21 75224
201 <9/5> Extreme Universe: Extreme Energy, Burst, Physics in Space 2012.09.03 75239
200 콜로퀴움입니다. 2005.12.29 75247
199 <5/16>모의실험을 이용한 물리학습 2008.05.13 75304
198 <3/16> Introduction to Experimental Nuclear Astrophysics 2007.03.15 75322
197 <9/14> Single-molecule techniques for studying biomolecules 2007.09.11 75381
196 <9/15> 2006.09.07 75438
195 <11/10>한국원전중성미자실험(RENO) 2006.11.08 75519
194 <9/17>Computational studies of materials and nanostructures 2010.09.08 75524
193 <11/12(수)> Photovoltaic effect and polarization-modulated conduction in ferroelectrics 2014.11.05 75550
192 2010학년도 2학기 콜로퀴엄 일정 안내 2010.08.10 75679
191 <9/10> Low temperature graphene synthesis 2010.08.30 75817
190 <4/2> 다중벽탄소나노튜브를 이용한 AFM 탐침 개발과 응용 2010.03.29 76135
189 <Nov. 30(Wed.) 4:30 PM> Chiral solitons for topological informatics 2016.11.23 76301
188 <10/30> Nambu and the Standard Model 2009.10.27 76373
187 <Sep. 7(Wed.) 4:30 PM>Manipulating spins in topological insulators 2016.09.02 76627