Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phase shift

Hongwei Wang; Guojing Tang; Yu He; Zhen Wang; Xingfeng Li; Lu Sun; Yong Zhang; Luqi Yuan; Jianwen Dong; Yikai Su

doi:10.1038/s41377-022-00993-4

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Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phase shift

Original Articles

- Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phase shift
- Light: Science & Applications Vol. 11, Issue 11, Pages: 2646-2654(2022)
- Affiliations：
  
  1.State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, 200240 Shanghai, China
  2.State Key Laboratory of Optoelectronic Materials and Technologies & School of Physics, Sun Yat-sen University, 510275 Guangzhou, China
  3.School of Physics and Astronomy, Shanghai Jiao Tong University, 200240 Shanghai, China
- Author bio：
  
  Luqi Yuan (yuanluqi@sjtu.edu.cn)
  Jianwen Dong (dongjwen@mail.sysu.edu.cn)
  Yikai Su (yikaisu@sjtu.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-00993-4
  CLC：
- Published：30 November 2022，
  
  Published Online：10 October 2022，
  
  Received：21 April 2022，
  
  Revised：21 September 2022，
  
  Accepted：25 September 2022
- Accepted：
Scan QR Code
Wang, H. W. et al. Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phase shift. Light: Science & Applications, 11, 2646-2654 (2022).
DOI：

Wang, H. W. et al. Ultracompact topological photonic switch based on valley-vortex-enhanced high-efficiency phase shift. Light: Science & Applications, 11, 2646-2654 (2022). DOI： 10.1038/s41377-022-00993-4.

摘要

Abstract

Topologically protected edge states based on valley photonic crystals (VPCs) have been widely studied

from theoretical verification to technical applications. However

research on integrated tuneable topological devices is still lacking. Here

we study the phase-shifting theory of topological edge modes based on a VPC structure. Benefiting from the phase vortex formed by the VPC structure

the optical path of the topological edge mode in the propagation direction is approximately two-fold that of the conventional optical mode in a strip waveguide. In experiments

we show a 1.57-fold improvement in π-phase tuning efficiency. By leveraging the high-efficiency phase-shifting properties and the sharp-turn features of the topological waveguide

we demonstrate an ultracompact 1 × 2 thermo-optic topological switch (TOTS) operating at telecommunication wavelengths. A switching power of 18.2 mW is needed with an ultracompact device footprint of 25.66 × 28.3 μm in the wavelength range of 1530–1582 nm. To the best of our knowledge

this topological photonic switch is the smallest switch of any dielectric or semiconductor 1 × 2/2 × 2 broadband optical switches

including thermo-optic and electro-optic switches. In addition

a high-speed transmission experiment employing the proposed TOTS is carried out to demonstrate the robust transmission of high-speed data. Our work reveals the phase-shifting mechanism of valley edge modes

which may enable diverse topological functional devices in many fields

such as optical communications

nanophotonics

and quantum information processing.

关键词

Keywords

references

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