Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime

Hangyong Shan; Ying Yu; Xingli Wang; Yang Luo; Shuai Zu; Bowen Du; Tianyang Han; Bowen Li; Yu Li; Jiarui Wu; Feng Lin; Kebin Shi; Beng Kang Tay; Zheng Liu; Xing Zhu; Zheyu Fang

doi:10.1038/s41377-019-0121-6

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Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime

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- Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime
- Light: Science & Applications Vol. 8, Issue 1, Pages: 105-113(2019)
- Affiliations：
  
  1.School of Physics, State Key Lab for Mesoscopic Physics; Academy for Advanced Interdisciplinary Studies; Collaborative Innovation Center of Quantum Matter, Peking University, 100871, Beijing, China
  2.CNRS International-NTU-Thales Research Alliance (CINTRA), Nanyang Technological University, Singapore, 637553, Singapore
  3.Centre for Micro-/Nano-Electronics (NOVITAS), School of Electrical and Electronic Engineering; Centre for Programmed Materials, School of Materials Science and Engineering, Nanyang Technological University, Singapore, 637553, Singapore
- Author bio：
  
  Zheyu Fang (zhyfang@pku.edu.cn)
- Funds：
- DOI：10.1038/s41377-019-0121-6
  CLC：
- Published：2019，
  
  Published Online：16 January 2019，
  
  Received：15 June 2018，
  
  Revised：03 January 2019，
  
  Accepted：03 January 2019
- Accepted：
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Shan, H. Y. et al. Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime. Light: Science & Applications, 8, 105-113 (2019).
DOI：

Shan, H. Y. et al. Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime. Light: Science & Applications, 8, 105-113 (2019). DOI： 10.1038/s41377-019-0121-6.

摘要

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 MoS

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 MoS

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.

关键词

Keywords

references

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