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 1078600
625 <4/14> X-ray absorption fine structure analyses on amorphous oxide films 2009.04.06 123770
624 <4/20> Chern-Simons gauge theories and M2 brane CFTs 2009.04.09 76995
623 <4/21> Experimental and Observational Astrophysics in the Infrared Wavebands 2009.04.17 126639
622 <4/27> BPS Vortices in Non-relativistic M2-brane Chern-Simons-matter Theory 2009.04.21 80853
621 <4/30> Updates on warped brane inflation 2009.04.21 122142
620 <5/11>Emergent Geometry as Quantum Gravity 2009.05.07 100764
619 <6/18> Multiferroics: Magnetism-driven Ferroelectricity 2009.05.27 115364
618 <6/17> Molecular dynamics simulation to study amorphous structure of Ge2Sb2Te5 2009.06.03 86905
617 <6/17> Oscillating Fuzzy Sphere and M5/anti M5 configurations in ABJM model 2009.06.16 246302
616 <7/8> 신물질 고온초전도 초청강연 2009.06.26 88288
615 <7/17> Atomic-scale polar oxide heterostructures: Growth and interfacial properties 2009.07.13 104708
614 <7/15> Experiment for Discoveries of Extrasolar Planets 2009.07.13 100304
613 <8/5>Brane superpotential via local Calabi-Yau spaces 2009.08.03 117127
612 <8/11>Cooking up elements in the universe: Recent activities at HRIBF 2009.08.11 108287
611 <9/15> Resistance Switching Behavior of Epitaxially Grown NiO Thin Films 2009.09.07 155663
610 <10/15> An Ideal Mean-Field Transition in a Driven Interacting System 2009.09.30 105101
609 <10/9> Smearing effect of membrane in plane-wave matrix model 2009.10.05 97269
608 <11/4>Plasmonic Properites of Metallic Nanostructures 2009.10.30 93090
607 <11/27> 중성자로 보는 작은 세상 속 큰 물리 2009.11.24 97306
606 <12/14> Breakup-Fusion and Knockout-Fusion Approach to Pre-Equilibrium Processes 2009.12.11 95698