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: 2D materials based metasurfaces & THz near-field spectroscopy

Speaker: 김 튼 튼 박사님 (성균관대학교 나노구조물리연구단)

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

Place: Natural Science 1,  Room No. 31214

Abstract: Manipulation of light is of paramount importance in optics. Recently, progress has been made over a class of new artificial media, metamaterials, which consist of the arrangement of periodic subwavelength optical elements that exhibit unusual optical properties beyond what natural materials can offer. Since their effective electromagnetic properties can be engineered by designing subwavelength scale metallic structures, called ‘meta-atoms’, these artificially constructed materials have promised a vast variety of otherwise unexpected physical phenomena such as a negative index of refraction, gigantic chirality, and invisible cloak. Even though fascinating effects can be obtained by passive metamaterials described above, for practical applications, it is highly desirable to enable dynamic tunability to their operations.
In this talk, I will introduce electrically controllable unique optical properties such as optical activity [1], anomalous refraction and focusing [2], and analogue of electromagnetically induced transparency (EIT) [3] by integrating 2D graphene layer onto metamaterials with different functional unit cells. The switching and linear modulation of unique optical properties are realized by changing coupling among meta-atoms or electrical conductivity of metallic structures caused by increased sheet conductivity of the single layer graphene. Besides, I will introduce a single annular aperture as a practical platform for THz absorption spectroscopy. THz tip-probe near-field measurement system is used to investigate the electric field distribution in a single annular aperture and near-field image clearly shows that the electric field is strongly confined at the gap. After inserting lactose in the gap, we can couple the intense optical fields of the single annular gap into the vibrational modes of lactose molecules. We observed high contrast THz absorbance signals drastically suppressing of the transmitted light. This result indicates that the single annular aperture can be used as a platform that is promising avenues toward future drastic miniaturization of THz devices and sensors.
[1 ] T. T. Kim, et al, Sci ence Advances 3, e1701377 (2017
[2 ] T. T. Kim, et al, Advanced Optical Materials 6(1) 1700507, (2018)
[3 ] T. T. Kim, et al, ACS Photonics, 5(5), 1800 1807 (2018)

번호 제목 날짜 조회 수
공지 2020학년도 2학기 콜로퀴움 일정 2020.07.16 25074
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 558750
629 2019학년도 2학기 콜로퀴움 일정 2019.07.17 383073
628 2020학년도 1학기 콜로퀴움 일정 2020.01.31 216506
627 <5/16(토)> 세미나 개최 안내 2015.05.18 117499
626 2017학년도 1학기 콜로퀴움 일정 2017.01.05 114604
625 2016학년도 1학기 콜로퀴움 일정 2016.02.03 110775
624 2019학년도 1학기 콜로퀴움 일정 2019.01.08 98862
623 2018학년도 2학기 콜로퀴움 일정 2018.07.03 93123
622 2018학년도 1학기 콜로퀴움 일정 2018.01.03 86302
621 <4/2> Radio Detection of Ultra High Energy Cosmic Rays and Neutrinos in Antarctica 2014.03.26 84156
620 2014학년도 2학기 콜로퀴움 일정 2014.09.11 81968
619 2017학년도 2학기 콜로퀴움 일정 2017.07.04 81282
618 <5/1>In vivo optical imaging of hemodynamic changes 2009.05.06 75570
617 <6/2> The black hole search at the LHC: critical comment 2011.06.01 75026
616 <9/1> 원자핵 자기공명(Nuclear Magnetic Resonance) 해설 - 원자선에서 영상까지 2010.08.30 73909
615 <10/28>Grazing Incidence X-ray Diffraction and Surface X-ray Scattering Study of Hematite (α-Fe2O3) Nano-cube 2011.10.26 73462
614 BK 석학초청 특별세미나 - Frustration and dimensional reduction in multi-orbital systems 2011.10.28 72867
613 <9/15> Resistance Switching Behavior of Epitaxially Grown NiO Thin Films 2009.09.07 72833
612 <4/19> Nuclear Reaction Theories 2011.04.14 72636
611 2016학년도 2학기 콜로퀴움 일정 2016.08.02 71688