| Title | Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime |
| Authors | Shan, Hangyong Yu, Ying Wang, Xingli Luo, Yang Zu, Shuai Du, Bowen Han, Tianyang Li, Bowen Li, Yu Wu, Jiarui Lin, Feng Shi, Kebin Tay, Beng Kang Liu, Zheng Zhu, Xing Fang, Zheyu |
| Affiliation | Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China Peking Univ, Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China Nanyang Technol Univ, CNRS Int NTU Thales Res Alliance CINTRA, Singapore 637553, Singapore Nanyang Technol Univ, Sch Elect & Elect Engn, Ctr Micro Nano Elect NOVITAS, Singapore 637553, Singapore Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmed Mat, Singapore 637553, Singapore |
| Issue Date | 2019 |
| Publisher | LIGHT-SCIENCE & APPLICATIONS |
| Abstract | Achieving strong coupling between plasmonic oscillators can significantly modulate their intrinsic optical properties. Here, we report the direct observation of ultrafast plasmonic hot electron transfer from an Au grating array to an MoS2 monolayer in the strong coupling regime between localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs). By means of femtosecond pump-probe spectroscopy, the measured hot electron transfer time is approximately 40 fs with a maximum external quantum yield of 1.65%. Our results suggest that strong coupling between LSPs and SPPs has synergetic effects on the generation of plasmonic hot carriers, where SPPs with a unique nonradiative feature can act as an 'energy recycle bin' to reuse the radiative energy of LSPs and contribute to hot carrier generation. Coherent energy exchange between plasmonic modes in the strong coupling regime can further enhance the vertical electric field and promote the transfer of hot electrons between the Au grating and the MoS2 monolayer. Our proposed plasmonic strong coupling configuration overcomes the challenge associated with utilizing hot carriers and is instructive in terms of improving the performance of plasmonic opto-electronic devices. |
| URI | http://hdl.handle.net/20.500.11897/551427 |
| ISSN | 2047-7538 |
| DOI | 10.1038/s41377-019-0121-6 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 物理学院 人工微结构和介观物理国家重点实验室 前沿交叉学科研究院 |
