korean english


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.
[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 1078711
269 <Nov.22(Wed.) 4:30 PM> Dark Side of the Universe 2017.11.15 69463
268 <June 14(Wed.) 4:30 PM> Stellar core collapse: success or failure, and future probes 2017.06.08 69804
267 <4/30> Physical principles and applications of ultrasound in diagnostics and therapy 2014.04.22 69939
266 <6/5> 물리학도가 증권가로 간 까닭은... 2013.05.29 69952
265 <3/20> 빛 : 우주의 신비를 푸는 열쇠 2013.03.14 70026
264 <March. 30(Wed.) 4:30 PM> Tetraneutron (four-neutron nucleus) 2016.03.24 70375
263 2012학년도 2학기 콜로퀴움 일정 안내 2012.09.03 70722
262 <5/15> Quantum Critical Superconductivity 2013.05.09 70853
261 <11/28> 별이 빛나는 밤에… 2012.11.22 71243
260 <6/11> 나노제조기술의 개요 및 응용 2010.06.07 71470
259 <6/4> Korea's challenges ahead for nuclear energy industry 2010.05.31 71573
258 2013학년도 1학기 콜로퀴움 일정 2013.02.19 71638
257 <12/5> 과학용어와 의학용어에 숨겨진 이야기 2012.11.28 71741
256 <9/21> 금융공학과 금융산업 2007.09.17 71808
255 <May.15(Wed.)> Three-body problems and three-body forces in Classic and Quantum Systems 2019.05.08 71808
254 <5/30> Dark Energy 2012.05.23 71828
253 <12/12> 자성체의 스커미온 동역학 2012.12.06 71898
252 <Nov.20(Wed.)>At the End of Space and Time: Imaging the Black Hole in M 87 2019.11.14 71977
251 <12/1>21세기 관측우주론 2006.11.28 72871
250 <3/28> 양자물리학의 성립 과정 2012.03.22 72904