Chiral transmission by an open evolution trajectory in a non-Hermitian system

Xiaoqian Shu; Qi Zhong; Kai Hong; Oubo You; Jian Wang; Guangwei Hu; Andrea Alù; Shuang Zhang; Demetrios N. Christodoulides; Lin Chen

doi:10.1038/s41377-024-01409-1

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Chiral transmission by an open evolution trajectory in a non-Hermitian system

Original Articles

- Chiral transmission by an open evolution trajectory in a non-Hermitian system
- Light: Science & Applications Vol. 13, Issue 4, Pages: 628-636(2024)
- Affiliations：
  
  1.Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
  2.Zhejiang Lab, Hangzhou 311121, China
  3.CREOL, College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA
  4.Department of Physics, The University of Hong Kong, Hong Kong, China
  5.School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
  6.Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA
  7.Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen 518063, China
- Author bio：
  
  Lin Chen (chen.lin@mail.hust.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01409-1
  CLC：
- Received：04 October 2023，
  
  Revised：28 January 2024，
  
  Accepted：2024-02-12，
  
  Published Online：05 March 2024，
  
  Published：30 April 2024
- Accepted：
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Shu, X. Q. et al. Chiral transmission by an open evolution trajectory in a non-Hermitian system. Light: Science & Applications, 13, 628-636 (2024).
DOI：

Shu, X. Q. et al. Chiral transmission by an open evolution trajectory in a non-Hermitian system. Light: Science & Applications, 13, 628-636 (2024). DOI： 10.1038/s41377-024-01409-1.

摘要

Abstract

Exceptional points (EPs)

at which two or more eigenvalues and eigenstates of a resonant system coalesce

are associated with non-Hermitian Hamiltonians with gain and/or loss elements. Dynamic encircling of EPs has received significant interest in recent years

as it has been shown to lead to highly nontrivial phenomena

such as chiral transmission in which the final state of the system depends on the encircling handedness. Previously

chiral transmission for a pair of eigenmodes has been realized by establishing a closed dynamical trajectory in parity-time- (PT-) or anti-PT-symmetric systems. Although chiral transmission of symmetry-broken modes

more accessible in practical photonic integrated circuits

has been realized by establishing a closed trajectory encircling EPs in anti-PT-symmetric systems

the demonstrated transmission efficiency is very low due to path-dependent losses. Here

we demonstrate chiral dynamics in a coupled waveguide system that does not require a closed trajectory. Specifically

we explore an open trajectory linking two infinite points having the same asymptotic eigenmodes (not modes in PT- and anti-PT-symmetric systems)

demonstrating that this platform enables high-efficiency chiral transmission

with each eigenmode localized in a single waveguide. This concept is experimentally implemented in a coupled silicon waveguide system at telecommunication wavelengths. Our work provides a new evolution strategy for chiral dynamics with superior performance

laying the foundation for the development of practical chiral-transmission devices.

关键词

Keywords

references

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