Magnetically controllable multimode interference in topological photonic crystals

Weiyuan Tang; Mudi Wang; Shaojie Ma; Che Ting Chan; Shuang Zhang

doi:10.1038/s41377-024-01433-1

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Magnetically controllable multimode interference in topological photonic crystals

Article

- Magnetically controllable multimode interference in topological photonic crystals
- Light: Science & Applications Vol. 13, Issue 5, Pages: 998-1005(2024)
- Affiliations：
- Author bio：
  
  dphchan@ust.hk
  eshuzhang@hku.hk
- Funds：
- DOI：10.1038/s41377-024-01433-1
  CLC：
- Received：19 October 2023，
  
  Revised：2024-01-23，
  
  Accepted：18 March 2024，
  
  Published Online：14 May 2024，
  
  Published：2024-12
- Accepted：
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Weiyuan Tang, Mudi Wang, Shaojie Ma, et al. Magnetically controllable multimode interference in topological photonic crystals[J]. Light: Science & Applications, 2024, 13(5): 998-1005.
DOI：

Weiyuan Tang, Mudi Wang, Shaojie Ma, et al. Magnetically controllable multimode interference in topological photonic crystals[J]. Light: Science & Applications, 2024, 13(5): 998-1005. DOI： 10.1038/s41377-024-01433-1.

摘要

Abstract

Topological photonic insulators show promise for applications in compact integrated photonic circuits due to their ability to transport light robustly through sharp bendings. The number of topological edge states relies on the difference between the bulk Chern numbers across the boundary

as dictated by the bulk edge correspondence. The interference among multiple topological edge modes in topological photonics systems may allow for controllable functionalities that are particularly desirable for constructing reconfigurable photonic devices. In this work

we demonstrate magnetically controllable multimode interference based on gyromagnetic topological photonic insulators that support two unidirectional edge modes with different dispersions. We successfully achieve controllable power splitting in experiments by engineering multimode interference with the magnetic field intensity or the frequency of wave. Our work demonstrates that manipulating the interference among multiple chiral edge modes can facilitate the advancement of highly efficient and adaptable microwave devices.

The power splitting of our waveguide system induced by multimode interference

is controlled by two chiral edge modes’ propagating phase difference

which depends on magnetic field intensity and wave frequency.

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