Perfect Absorption by an Atomically Thin Crystal
| Autor: | E. Courtade, Tien-Chang Lu, Feng Wang, Michael Henr Wentzel, Chu Yuan Hsu, Eric W. Martin, Hanna G. Ruth, Yu Hsun Chou, Tsu Chi Chang, Steven T. Cundiff, Hui Deng, Jason Horng |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Exciton FOS: Physical sciences Physics::Optics General Physics and Astronomy 02 engineering and technology 01 natural sciences Condensed Matter::Materials Science 0103 physical sciences Monolayer Sensitivity (control systems) 010306 general physics Absorption (electromagnetic radiation) Condensed Matter - Materials Science business.industry Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Light intensity Semiconductor Optoelectronics Photonics 0210 nano-technology business Ultrashort pulse Optics (physics.optics) Physics - Optics |
| Zdroj: | Physical Review Applied. 14 |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.14.024009 |
| Popis: | Optical absorption is one of fundamental light-matter interactions. In most materials, optical absorption is a weak perturbation to the light. In this regime, absorption and emission are irreversible, incoherent processes due to strong damping. Excitons in monolayer transition metal dichalcogenides, however, interact strongly with light, leading to optical absorption in the non-perturbative regime where coherent re-emission of the light has to be considered. Between the incoherent and coherent limits, we show that a robust critical coupling condition exists, leading to perfect optical absorption. Up to 99.6% absorption is measured in a sub-nanometer thick MoSe2 monolayer placed in front of a mirror. The perfect absorption is controlled by tuning the exciton-phonon, exciton-exciton, and exciton-photon interactions by temperature, pulsed laser excitation, and a movable mirror, respectively. Our work suggests unprecedented opportunities for engineering exciton-light interactions using two-dimensional atomically thin crystals, enabling novel photonic applications including ultrafast light modulators and sensitive optical sensing. |
| Databáze: | OpenAIRE |
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