Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes

Guo-Jing Tang; Xiao-Dong Chen; Lu Sun; Chao-Heng Guo; Meng-Yu Li; Zhong-Tao Tian; Hou-Hong Chen; Hong-Wei Wang; Qi-Yao Sun; Ying-Di Pan; Xin-Tao He; Yi-Kai Su; Jian-Wen Dong

doi:10.1038/s41377-024-01512-3

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Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes

Original Articles

- Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes
- Light: Science & Applications Vol. 13, Issue 8, Pages: 1623-1630(2024)
- Affiliations：
  
  1.School of Physics & State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China
  2.State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Author bio：
  
  Xin-Tao He (hext9@mail.sysu.edu.cn)
  Yi-Kai Su (yikaisu@sjtu.edu.cn)
  Jian-Wen Dong (dongjwen@mail.sysu.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01512-3
  CLC：
- Published：31 August 2024，
  
  Published Online：16 July 2024，
  
  Received：16 November 2023，
  
  Revised：19 June 2024，
  
  Accepted：26 June 2024
- Accepted：
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Tang, G. J. et al. Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes.,Light: Science & Applications, 13, 1623-1630 (2024).
DOI：

Tang, G. J. et al. Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes.,Light: Science & Applications, 13, 1623-1630 (2024). DOI： 10.1038/s41377-024-01512-3.

摘要

Abstract

3-dB couplers

which are commonly used in photonic integrated circuits for on-chip information processing

precision measurement

and quantum computing

face challenges in achieving robust performance due to their limited 3-dB bandwidths and sensitivity to fabrication errors. To address this

we introduce topological physics to nanophotonics

developing a framework for topological 3-dB couplers. These couplers exhibit broad working wavelength range and robustness against fabrication dimensional errors. By leveraging valley-Hall topology and mirror symmetry

the photonic-crystal-slab couplers achieve ideal 3-dB splitting characterized by a wavelength-insensitive scattering matrix. Tolerance analysis confirms the superiority on broad bandwidth of 48 nm and robust splitting against dimensional errors of 20 nm. We further propose a topological interferometer for on-chip distance measurement

which also exhibits robustness against dimensional errors. This extension of topological principles to the fields of interferometers

may open up new possibilities for constructing robust wavelength division multiplexing

temperature-drift-insensitive sensing

and optical coherence tomography applications.

关键词

Keywords

references

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