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: 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.
Reference
[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 15109
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 548413
625 <11/5(Thu.)> Higher Spin Cooper Pairs 2020.10.27 6
624 <Nov.4(Wed.)>Progresses in Elucidating the Optoelectronic Properties of Perovskite Semiconductor 2020.10.28 6
623 <Oct.28(Wed.)> Physics of Global Warming 2020.10.22 110
622 <Oct.14(Wed.)>New Ways to Search for the Dark World 2020.10.12 181
621 <Oct.7(Wed.)>Organic Photodiode for Image Sensor 2020.09.24 544
620 <Sep.23(Wed.)>나는 내 마음이야 2020.09.16 568
619 <Sep.16(Wed.)>Artificial Crystal 2020.09.14 653
618 <8/1(Sat.)> Recent Advances in Deep Learning 2020.07.29 1109
617 <2/17(Mon.)> Magneto-optical study of the Dirac semimetal Cd3As2 in Voigt geometry 2020.02.11 12939
616 <Dec.11(Wed.)>데이터 과학으로서의 물리학. 그리고 금융투자업 2019.12.04 13970
615 <12/17(Tue.)> Nuclear spectroscopy with low energy reaction thermal neutrons in ILL 2019.12.17 14991
614 <12/10(Tue.)> Investigating dark matter signals at neutrino telescopes 2019.12.06 15161
613 <12/6(Fri.)>topological phase transitions in Kitaev quantum spin liquids. 2019.12.04 15535
612 <Nov.13(Wed.)>The Science of Quark-Gluon Plasma 2019.11.06 17736
611 <Nov.20(Wed.)>At the End of Space and Time: Imaging the Black Hole in M 87 2019.11.14 17745
» <Dec.4(Wed.)>2D materials based metasurfaces & THz near-field spectroscopy 2019.11.27 18524
609 <Oct.30(Wed.)> 왼손과 오른손, 기본 입자와 끈 2019.10.24 19163
608 <10/1(Tue.) Mini-Workshop on BSM Physics with Neutrino Detectors 2019.09.30 19677
607 <9/24(Tue) 4:00 pm ~ > Structure Formation with Two Periods of Inflation: Beyond plain LCDM 2019.09.17 20457