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 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1008003
306 <March. 23(Wed.) 4:30 PM> 조선시대의 천문시계 2016.03.17 55329
305 <Sep. 29(Wed.)> Longitudinal Spin Seebeck effect in Pt/YIG structure with monolayer WSe2 and MoS2 interlayer 2021.09.16 56029
304 <Nov.15(Wed.) 4:30 PM> Mixed metal oxide films for energy and memory device applications 2017.11.08 56525
303 <Oct. 19(Wed.) 10:00 AM> Hyper-Kamiokande project -The future of neutrino physics in Japan 2016.10.12 56990
302 <5/13(수) 오후4:30분> 내가 몰랐던 대한민국 2015.05.07 57574
301 <Oct. 5(Wed.) 4:30 PM> 국제원자력기구 (IAEA)와 핵데이터 2016.09.22 58188
300 <May.2(Wed.) 4:30 PM> Machine learning and statistical physics 2018.04.23 58279
299 <Mar.13(Wed.)> Physics in Medicine: Magnetic Resonance Imaging 2019.03.07 58520
298 <May.15(Wed.)> Three-body problems and three-body forces in Classic and Quantum Systems 2019.05.08 58521
297 <4/29(수) 오후4:30분> 양자정보 2015.04.23 58628
296 <Nov. 4(Wed.) 4:30 PM> 기능성 산화물과 그래핀을 접합한 나노소자의 특성 변화 2015.10.30 58886
295 <June 14(Wed.) 4:30 PM> Stellar core collapse: success or failure, and future probes 2017.06.08 59243
294 <Nov. 23(Wed.) 4:30 PM> Dry (Plasma) etch process in Semiconductor Device 2016.11.16 59255
293 <12/3(수)> 진공은 무( 無)로 채워지지 않았다. 힉스입자를 찾아서 2014.11.27 59280
292 <3/25(수) 오후4:30분> 슈퍼컴퓨터와 국가경쟁력 2015.03.19 59585
291 <Sep.19(Wed.) 4:30 PM> Superconducting Quantum Computing (초전도 양자컴퓨팅) 2018.09.12 59790
290 <3/11(수) 오후4시:30분> 테크노-이매지네이션(Techno-imagination) 2015.03.04 59825
289 <5/6(수) 오후4:30분> 빛의 여행 2015.04.29 59855
288 <Nov.14(Wed.) 4:30 PM> Status and Prospects for the IceCube Neutrino Observatory 2018.11.07 59989
287 <Nov.20(Wed.)>At the End of Space and Time: Imaging the Black Hole in M 87 2019.11.14 60496