Photoswitchable exceptional points derived from bound states in the continuum

Lei Wang; Hang Liu; Junwei Liu; Aoxuan Liu; Jialiang Huang; Qiannan Li; Hui Dai; Caihong Zhang; Jingbo Wu; Kebin Fan; Huabing Wang; Biaobing Jin; Jian Chen; Peiheng Wu

doi:10.1038/s41377-025-02036-0

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Photoswitchable exceptional points derived from bound states in the continuum

Original Articles

- Photoswitchable exceptional points derived from bound states in the continuum
- Photoswitchable exceptional points derived from bound states in the continuum
- Light: Science & Applications 2025年14卷第12期页码：4040-4048
- Affiliations：
  
  1.Research Institute of Superconductor Electronics (RISE), Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
  2.Purple Mountain Laboratories, Nanjing 211111, China
- Author bio：
  
  Caihong Zhang (chzhang@nju.edu.cn)
  Kebin Fan (kebin.fan@nju.edu.cn)
- Funds：
- DOI：10.1038/s41377-025-02036-0
  中图分类号：
- 收稿：2025-03-17，
  
  修回：2025-08-12，
  
  录用：2025-09-04，
  
  网络出版：2025-10-28，
  
  纸质出版：2025-12-31
- Accepted：
Scan QR Code
Lei Wang, Hang Liu, Junwei Liu, 等. Photoswitchable exceptional points derived from bound states in the continuum[J]. Light: Science & Applications, 2025,14(12):4040-4048.

Wang, L. et al. Photoswitchable exceptional points derived from bound states in the continuum. Light: Science & Applications, 14, 4040-4048 (2025).
Lei Wang, Hang Liu, Junwei Liu, 等. Photoswitchable exceptional points derived from bound states in the continuum[J]. Light: Science & Applications, 2025,14(12):4040-4048. DOI： 10.1038/s41377-025-02036-0.

Wang, L. et al. Photoswitchable exceptional points derived from bound states in the continuum. Light: Science & Applications, 14, 4040-4048 (2025). DOI： 10.1038/s41377-025-02036-0.

摘要

Abstract

Bound states in the continuum (BICs) and exceptional points (EPs)

as two distinct physical singularities represented by complex frequencies in non-Hermitian systems

have garnered significant attention and clear definitions in their respective fields in recent years. They share overlapping applications in areas such as high-sensitivity sensing and laser emission. However

the transition between the two

inspired by these intersections

remains largely unexplored. In this work

we reveal the transition process in a non-Hermitian two-mode system

evolving from one bound singularity to a two-dimensional exceptional ring

where the EP is the coalescent state of the quasi-Friedrich-Wintgen (FW)-BIC. This phenomenon is experimentally validated through pored dielectric metasurfaces in terahertz band. Furthermore

external pumping induced photocarriers as the dissipative perturbation

facilitates the breaking of degeneracy in the complex eigenfrequency and enables dynamic EP switching. Finally

we experimentally demonstrate a switchable terahertz beam deflection driven by the phase singularities of the EP. These findings are instrumental in advancing the development of compact devices for sensing and wavefront control within non-Hermitian systems.

关键词

Keywords

references

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