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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1090412
398 <6/1> Electron phonon coupling effect in 4d transition metal oxide magnetism 2011.05.26 107093
397 <6/8> 액체금속 및 물의 과냉각 현상과 국소구조와의 관계 : 정전기 공중부양 기술 및 dynamic diamond anvil cell 2011.06.07 112497
396 2011학년도 2학기 콜로퀴움 일정 안내 2011.08.22 89447
395 <9/7> 과학과 예술 (Science and Arts) 2011.08.30 81464
394 <9/21> Electronic phase transition in low dimensional SrTiO3/(Sr1-x,Lax)TiO3 oxide superlattices 2011.09.09 84896
393 <10/5> Acoustic Metamaterials and Reversal of Sound 2011.09.26 95380
392 <10/12> Introduction to the Proton Engineering Frontier Project 2011.10.10 81827
391 <10/26> 빛으로 보는 세상 2011.10.17 80071
390 <11/2> Color Science for Reflective mode Optical Shutter 2011.10.27 167933
389 <11/9> Bosons in high Tc superconductors: an experimental survey 2011.10.31 115037
388 <11/16> Study of carrier transport and charging effects in organic devices 2011.11.10 117831
387 <11/23> How statistical physics contributes to Internet world: perspectives, methods and applications 2011.11.15 93620
386 <11/30> 기능성 산화물의 현황과 응용 2011.11.24 80574
385 <12/7> Optical Antennas 2011.11.30 90108
384 2012학년도 1학기 콜로퀴움 일정 안내 [5] 2012.02.29 86180
383 <3/14> 시공간 왜곡과 우주론(Spacetime warp and Cosmology) 2012.03.07 79489
382 <3/21> 우주가속팽창의 원인 규명 2012.03.15 91164
381 <3/28> 양자물리학의 성립 과정 2012.03.22 73282
380 <4/4> Cooking up elements in the universe: Nuclear astrophysics with exotic ion beams 2012.03.29 86638
379 <4/18> 삼중항 여기자를 이용한 유기광전소자 연구 2012.04.05 166912