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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
Keywords: Hot Electron Transfer
DRNTU::Engineering::Electrical and electronic engineering
Strong Coupling Regime
Issue Date: 2019
Source: Shan, H., Yu, Y., Wang, X., Luo, Y., Zu, S., Du, B., . . . Fang, Z. (2019). Direct observation of ultrafast plasmonic hot electron transfer in the strong coupling regime. Light: Science & Applications, 8(1), 9-. doi:10.1038/s41377-019-0121-6
Series/Report no.: 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.
ISSN: 2095-5545
DOI: 10.1038/s41377-019-0121-6
Rights: © 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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