Giant two-photon upconversion from 2D exciton in doubly-resonant plasmonic nanocavity

Fangxun Liu; Haiyi Liu; Cheng Chi; Wenqi Qian; Yuchen Dai; Guangyi Tao; Sihan Lin; Shihan Ding; Menghan Yu; Hongliang Liu; Lie Lin; Pengfei Qi; Zheyu Fang; Weiwei Liu

doi:10.1038/s41377-025-02010-w

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Giant two-photon upconversion from 2D exciton in doubly-resonant plasmonic nanocavity

Original Articles

- Giant two-photon upconversion from 2D exciton in doubly-resonant plasmonic nanocavity
- Light: Science & Applications Vol. 14, Issue 10, Pages: 3290-3300(2025)
- Affiliations：
  
  1.Institute of Modern Optics, Nankai University, Tianjin Key Laboratory of Microscale Optical Information Science and Technology, Tianjin, China
  2.Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing, China
  3.School of Physics, State Key Laboratory for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Quantum Matter, Nano-optoelectronics Frontier Center of Ministry of Education, Peking University, Beijing, China
  4.Academy for Advanced Interdisciplinary Studies, Nankai University, Tianjin, China
- Author bio：
  
  Pengfei Qi (qipengfei@nankai.edu.cn)
- Funds：
- DOI：10.1038/s41377-025-02010-w
  CLC：
- Received：21 April 2025，
  
  Revised：2025-08-06，
  
  Accepted：13 August 2025，
  
  Published Online：10 September 2025，
  
  Published：31 October 2025
- Accepted：
Scan QR Code
Liu, F. X. et al. Giant two-photon upconversion from 2D exciton in doubly-resonant plasmonic nanocavity. Light: Science & Applications, 14, 3290-3300 (2025).
DOI：

Liu, F. X. et al. Giant two-photon upconversion from 2D exciton in doubly-resonant plasmonic nanocavity. Light: Science & Applications, 14, 3290-3300 (2025). DOI： 10.1038/s41377-025-02010-w.

摘要

Abstract

Photon upconversion through high harmonic generation

multiphoton absorption

Auger recombination and phonon scattering performs a vital role in energy conversion and renormalization. Considering the reduced dielectric screening and enhanced Coulomb interactions

semiconductor monolayers provide a promising platform to explore photon upconversion at room temperature. Additionally

two-photon upconversion was recently demonstrated as an emerging technique to probe the excitonic dark states due to the extraordinary selection rule compared with conventional excitation. However

highly efficient two-photon upconversion still remains challenging due to the limited multiphoton absorption efficiency and long radiative lifetimes. Here

a 2440-fold enhancement of two-photon luminescence (TPL) is achieved in doubly resonant plasmonic nanocavities due to the amplified light collection

enhanced excitation rate

and increased quantum efficiency. To gain more insight into the attractive doubly resonant enhancement in such a plasmon−exciton coupling system

the intriguing thermally tuned excitonic upconversion and optimized amplification factor > 3000 are realized at 350 K. Meanwhile

the single resonance enhanced photoluminescence (PL) (~890-fold) and second-harmonic generation (SHG) (~134-fold) are elaborately demonstrated. These results establish a foundation for developing cost-effective

high-performance nonlinear photonic devices and probing fine excitonic states via configuring plasmonic nanocavities.

关键词

Keywords

references

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