Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor

Yuxiang Tang; Yanbin Zhang; Qirui Liu; Ke Wei; Xiang'ai Cheng; Lei Shi; Tian Jiang

doi:10.1038/s41377-022-00754-3

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Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor

Articles

- Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor
- Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor
- LSA 2022年11卷第5期页码：877-887
- Affiliations：
  
  1.College of Advanced Interdisciplinary Studies, National University of Defense Technology, 410073 Changsha, China
  2.Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education), and State Key Laboratory of Surface Physics, Department of Physics, Fudan University, 200433 Shanghai, China
  3.State Key Laboratory of High Performance Computing, College of Computer, National University of Defense Technology, 410073 Changsha, China
  4.Beijing Institute for Advanced Study, National University of Defense Technology, 100000 Beijing, China
- Author bio：
  
  Lei Shi (lshi@fudan.edu.cn)
  Tian Jiang (tjiang@nudt.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00754-3
  中图分类号：
- 纸质出版日期：2022-05-31，
  
  网络出版日期：2022-04-14，
  
  收稿日期：2021-12-13，
  
  修回日期：2022-02-24，
  
  录用日期：2022-02-25
- Accepted：
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Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor[J]. LSA, 2022,11(5):877-887.

Tang, Y. X. et al. Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor. Light: Science & Applications, 11, 877-887 (2022).
Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor[J]. LSA, 2022,11(5):877-887. DOI： 10.1038/s41377-022-00754-3.

Tang, Y. X. et al. Interacting plexcitons for designed ultrafast optical nonlinearity in a monolayer semiconductor. Light: Science & Applications, 11, 877-887 (2022). DOI： 10.1038/s41377-022-00754-3.

摘要

Abstract

Searching for ideal materials with strong effective optical nonlinear responses is a long-term task enabling remarkable breakthroughs in contemporary quantum

and nonlinear optics. Polaritons

hybridized light-matter quasiparticles

are an appealing candidate to realize such nonlinearities. Here

we explore a class of peculiar polaritons

named plasmon–exciton polaritons (plexcitons)

in a hybrid system composed of silver nanodisk arrays and monolayer tungsten-disulfide (WS

)

which shows giant room-temperature nonlinearity due to their deep-subwavelength localized nature. Specifically

comprehensive ultrafast pump–probe measurements reveal that plexciton nonlinearity is dominated by the saturation and higher-order excitation-induced dephasing interactions

rather than the well-known exchange interaction in traditional microcavity polaritons. Furthermore

we demonstrate this giant nonlinearity can be exploited to manipulate the ultrafast nonlinear absorption properties of the solid-state system. Our findings suggest that plexcitons are intrinsically strongly interacting

thereby pioneering new horizons for practical implementations such as energy-efficient ultrafast all-optical switching and information processing.

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Keywords

references

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