| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | 특별심포지엄 3. 나노기술 기반 초고속 광정보 소자 심포지엄-오거나이저: 송용원(KIST) |
| 제목 | Ultrastrong Light-Matter Interactions in Two-Dimensional Materials Enabled by Surface Polaritons and Its Application for Molecular Fingerprinting |
| 초록 | Two-dimensional (2D) materials have been the focus of intense research in the field of photonics since their exceptional electrical, mechanical, and optical properties can enable novel optoelectronic and nanophotonic devices that can outperform state-of-the-art technologies. One of main challenges for practical applications of 2D-material-based photonic devices is weak light-matter interactions in 2D materials. There have been a number of approaches to enhance the light-matter interactions in 2D materials using silicon waveguides, microcavities, and plasmonic antennas that can focus far-field radiation to subwavelength-scale near-field hot spots. Surface polaritons in 2D materials, a result of strong coupling of light and particles such as electrons, phonons, and excitons, are able to concentrate light better than any other approaches aforementioned. Due to the extreme momentum mismatch, however, the efficiency of coupling far-field radiation to surface polaritons is inherently low, which hinders to explore full potential of surface polaritons in improving the light-matter interactions in 2D materials. In this work, we demonstrate polaritonic resonators based on graphene and hBN that can couple far-field radiation to surface polaritons with near-unity efficiencies. The high efficiency is made possible by the newly proposed coupling mechanism that enables to cascade an infinite series of surface polaritons. Our polaritonic resonators with high coupling efficiencies enables to detect molecular fingerprints from angstrom-thick dielectric and bio-molecular films. |
| 저자 | 이인호1, Daehan Yoo2, Phaedon Avouris3, Tony Low2, Sang-Hyun Oh2 |
| 소속 | 1한국과학기술(연), 2Univ. of Minnesota, 3IBM T. J. Watson Research Center |
| 키워드 | 2D materials; plasmonics; surface polaritons |
