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

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

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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.

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

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Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China

Zhejiang Lab,Hangzhou 311121,China

CREOL,College of Optics and Photonics,University of Central Florida,Orlando,Florida 32816,USA

Department of Physics,The University of Hong Kong,Hong Kong,China

School of Electrical and Electronic Engineering,Nanyang Technological University,50 Nanyang Avenue,Singapore 639798,Singapore

Photonics Initiative,Advanced Science Research Center,City University of New York,New York,NY 10031,USA

Shenzhen Huazhong University of Science and Technology Research Institute,Shenzhen 518063,China

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National Natural Science Foundation of ChinaNational Key Research and Development Project of ChinaScience,Technology and Innovation Commission of Shenzhen MunicipalityState Key Laboratory of Advanced Technology for Materials Synthesis and Processing(Wuhan University of Technology)AFOSR MURI

120741372021YFB2801903JCYJ20220530161010023FA9550-18-1-0235

2024

10.1038/s41377-024-01409-1

光:科学与应用(英文版)
中国科学院长春光学精密机械与物理研究所

光:科学与应用(英文版)

CSTPCD
ISSN：2095-5545
年,卷(期)：2024.13(4)
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