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 1078989
466 <12/1>21세기 관측우주론 2006.11.28 72877
465 <3/28> 양자물리학의 성립 과정 2012.03.22 72908
464 <2/7>Emergent p-wave Kondo Coupling in Multi-Orbital Bands with Mirror Symmetry Breaking 2013.02.06 72955
463 <9/22(Thu.) 10:30> Bulk-boundary correspondence from the inter-cellular Zak phase 2016.08.29 73004
462 <7/2> Dyonic Instanton and Its Higgs Structures 2008.07.01 73227
461 <5/1> Supersymmetry Breaking in Chern-Simons-matter Theories 2012.04.30 73234
460 <5/9> Searching for 5th dimension 2012.05.03 73237
459 <11/20> 마침내 발견된 신의 입자: 힉스 보존 2013.11.14 73348
458 <Sep. 16(Wed.) 4:30 PM> Watching molecular targets in living bodies: the cutting edge in clinical medicine 2015.09.09 73348
457 <6/1> 암흑물질 탐색 2007.05.28 73377
456 <March. 16(Wed.) 4:30 PM> 초고속반도체의 블랙다이아몬드™,low-k 2016.03.10 73946
455 <6/3(수) 오후4:30분> The Quest for Dark Matter: Discovering Its Nature Underground? 2015.05.28 74280
454 <4/24> How to introduce the monopole in quantum mechanics? 2012.04.23 74419
453 <9/7> On Dark Matter and its indirect detection with box-shaped gamma-rays 2012.09.05 74438
452 <11/24>생물계의 물리학적 연구: 단분자 생물물리학과 세포 역학 연구 2006.11.21 74459
451 THINKING PHYSICS 발표회 2009.03.16 74807
450 <Nov. 25(Wed.) 4:30 PM> Present and Future of OLED 2015.11.19 74841
449 <7/12(Tue.) 11:00> Spin-direction-dependent magnetoelastic coupling on MnO, CoO, and NiO file 2016.07.01 74862
448 <12/6(Fri.)>topological phase transitions in Kitaev quantum spin liquids. 2019.12.04 74913
447 <3/30> Extreme Energy, Extreme Universe (Search for Ultra High Energy Particles in Space) 2007.03.26 74937