Manipulating the light-matter interactions in plasmonic nanocavities at 1 nm spatial resolution

• Published in: Light, science & applications Vol. 11; no. 1; p. 235
• Main Authors: Wen, Bao-Ying, Wang, Jing-Yu, Shen, Tai-Long, Zhu, Zhen-Wei, Guan, Peng-Cheng, Lin, Jia-Sheng, Peng, Wei, Cai, Wei-Wei, Jin, Huaizhou, Xu, Qing-Chi, Yang, Zhi-Lin, Tian, Zhong-Qun, Li, Jian-Feng
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 26-07-2022; Springer Nature B.V; Nature Publishing Group
• Subjects: 140/125; 140/133; 639/624/1107/527; 639/624/400/1021; Laboratories; Lasers; Light; Microwaves; Molybdenum disulfide; Optical and Electronic Materials; Optical Devices; Optics; Photonics; Photons; Physics; Physics and Astronomy; RF and Optical Engineering; Spatial discrimination; Vertical distribution
• ISSN: 2047-7538; 2095-5545; 2047-7538
• DOI: 10.1038/s41377-022-00918-1

The light-matter interaction between plasmonic nanocavity and exciton at the sub-diffraction limit is a central research field in nanophotonics. Here, we demonstrated the vertical distribution of the light-matter interactions at ~1 nm spatial resolution by coupling A excitons of MoS
2
and gap-mode plasmonic nanocavities. Moreover, we observed the significant photoluminescence (PL) enhancement factor reaching up to 2800 times, which is attributed to the Purcell effect and large local density of states in gap-mode plasmonic nanocavities. Meanwhile, the theoretical calculations are well reproduced and support the experimental results.
The plasmon-exciton interaction between gap-mode nanocavities and A excitons of MoS2 is investigated, and the longitudinal distribution of the plasmon-exciton interactions is obtained at ~1 nm spatial resolution.