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 1090735
276 <9/18> 생체계에서의 협동현상: 박테리아 수영에서부터 고분자 수송현상까지 2009.09.14 95519
275 <9/11> Epitaxial Oxygen Sponge 2013.09.09 95499
274 <10/5> Acoustic Metamaterials and Reversal of Sound 2011.09.26 95406
273 <5/7> Contribution of Internal and Surface Traps to Blinking Statistics in Colloidal Quantum Dots 2014.04.30 95320
272 <3/12> Nano Structure of wide Band Gap Semiconductors 2010.03.08 95098
271 <4/9> 중이온가속기 KoRIA 구축 계획 2010.04.02 94599
270 <11/16> 방사선과 그 이용 2007.11.16 94204
269 <5/12> An Infrared View of the Universe 2006.05.09 94018
268 <Sep. 9(Wed.) 4:30 PM> Electronic structures of strongly-correlated systems 2015.09.03 94018
267 <4/11> 방사광 연 X선을 이용한 미시적 물성 연구 2008.04.07 93838
266 <11/23> How statistical physics contributes to Internet world: perspectives, methods and applications 2011.11.15 93651
265 <11/23> Hot/Dense QCD 2007.11.16 93518
264 <9/19> Novel mechanical degree of freedom at nanoscales 2012.09.13 93192
263 <5/29> Study on the electronic interactions in solids under high magnetic fields 2013.05.23 93040
262 <6/5>Magnetism and Superconductivity 2009.05.27 92852
261 <4/30> Characterization of Molecular Transistors and Organic Memory Devices 2010.04.15 92591
260 <3/12> Where, when and how atomic nuclei were cooked in universe? 2014.03.07 91906
259 <Sept.11(Wed.)> Fantastic physics and materials, how to find them? 2019.09.06 91584
258 <Sep. 7(Wed.) 4:30 PM>Manipulating spins in topological insulators 2016.09.02 91402
257 <Oct.30(Wed.)> 왼손과 오른손, 기본 입자와 끈 2019.10.24 91258