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 1092022
76 <Mar.20(Wed.)> Connecting Thermoelectricity and Superconductivity by Pressure Bridge 2019.03.13 58889
75 <Mar.27(Wed.)> Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope 2019.03.20 95999
74 <April.3(Wed.)> 전자구조계산을 이용한 새로운 양자물질 연구 2019.03.27 47823
73 <April.10(Wed.)> 자성 반데르발스 물질 발견과 전망(Discovery and Perspective of magnetic van der Waals materials) 2019.04.04 49259
72 <April.17(Wed.)> Emerging Artificial Synapse for Learning- and Energy-Efficient Neuromorphic System 2019.04.11 130859
71 <May.1(Wed.)> Introduction of AMS Application 2019.04.24 70553
70 <May.8(Wed.)> Genesis of Matter 2019.05.01 42271
69 <May.15(Wed.)> Three-body problems and three-body forces in Classic and Quantum Systems 2019.05.08 76557
68 <May.22(Wed.)> Introduction to exotic quantum states in solids 2019.05.15 80308
67 <June.5(Wed.)> Fluid gravity duality 2019.05.29 68843
66 <June.12(Wed.)> Ribocomputing: Cellular Logic Computation using RNA Devices file 2019.06.07 245198
65 2019학년도 2학기 콜로퀴움 일정 2019.07.17 429042
64 <Sept.11(Wed.)> Fantastic physics and materials, how to find them? 2019.09.06 91855
63 <Sept.18(Wed.)> Rare-earth: versatility and capability 2019.09.16 90030
62 <Oct.2(Wed.)> Fundamental physics with high-energy atmospheric and cosmic neutrinos today and in the future 2019.09.26 72212
61 <Oct.16(Wed.)> 솟구치는 초고에너지 입자의 미스테리 2019.10.10 148145
60 <Oct.30(Wed.)> 왼손과 오른손, 기본 입자와 끈 2019.10.24 91354
59 <Nov.13(Wed.)>The Science of Quark-Gluon Plasma 2019.11.06 37693
58 <Nov.20(Wed.)>At the End of Space and Time: Imaging the Black Hole in M 87 2019.11.14 77523
» <Dec.4(Wed.)>2D materials based metasurfaces & THz near-field spectroscopy 2019.11.27 84841