Chiral transmission by an open evolution trajectory in a non-Hermitian system
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...
| Main Authors: | , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/175598 |
| _version_ | 1811689499031240704 |
|---|---|
| author | Shu, Xiaoqian Zhong, Qi Hong, Kai You, Oubo Wang, Jian Hu, Guangwei Alù, Andrea Zhang, Shuang Christodoulides, Demetrios N. Chen, Lin |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Shu, Xiaoqian Zhong, Qi Hong, Kai You, Oubo Wang, Jian Hu, Guangwei Alù, Andrea Zhang, Shuang Christodoulides, Demetrios N. Chen, Lin |
| author_sort | Shu, Xiaoqian |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T05:49:04Z |
| format | Journal Article |
| id | ntu-10356/175598 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:49:04Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1755982024-05-03T15:41:51Z Chiral transmission by an open evolution trajectory in a non-Hermitian system Shu, Xiaoqian Zhong, Qi Hong, Kai You, Oubo Wang, Jian Hu, Guangwei Alù, Andrea Zhang, Shuang Christodoulides, Demetrios N. Chen, Lin School of Electrical and Electronic Engineering Engineering Closed trajectory Eigen modes 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. Published version National Natural Science Foundation of China (Grant No. 12074137), National Key Research and Development Project of China (Grant No. 2021YFB2801903), Science, Technology and Innovation Commission of Shenzhen Municipality (Grant No. JCYJ20220530161010023), State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology), and AFOSR MURI (FA9550-18-1-0235). 2024-04-30T04:44:10Z 2024-04-30T04:44:10Z 2024 Journal Article Shu, X., Zhong, Q., Hong, K., You, O., Wang, J., Hu, G., Alù, A., Zhang, S., Christodoulides, D. N. & Chen, L. (2024). Chiral transmission by an open evolution trajectory in a non-Hermitian system. Light: Science & Applications, 13(1), 65-. https://dx.doi.org/10.1038/s41377-024-01409-1 2047-7538 https://hdl.handle.net/10356/175598 10.1038/s41377-024-01409-1 38438358 2-s2.0-85187133979 1 13 65 en Light: Science & Applications © The Author(s) 2024. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. application/pdf |
| spellingShingle | Engineering Closed trajectory Eigen modes Shu, Xiaoqian Zhong, Qi Hong, Kai You, Oubo Wang, Jian Hu, Guangwei Alù, Andrea Zhang, Shuang Christodoulides, Demetrios N. Chen, Lin Chiral transmission by an open evolution trajectory in a non-Hermitian system |
| title | Chiral transmission by an open evolution trajectory in a non-Hermitian system |
| title_full | Chiral transmission by an open evolution trajectory in a non-Hermitian system |
| title_fullStr | Chiral transmission by an open evolution trajectory in a non-Hermitian system |
| title_full_unstemmed | Chiral transmission by an open evolution trajectory in a non-Hermitian system |
| title_short | Chiral transmission by an open evolution trajectory in a non-Hermitian system |
| title_sort | chiral transmission by an open evolution trajectory in a non hermitian system |
| topic | Engineering Closed trajectory Eigen modes |
| url | https://hdl.handle.net/10356/175598 |
| work_keys_str_mv | AT shuxiaoqian chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT zhongqi chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT hongkai chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT yououbo chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT wangjian chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT huguangwei chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT aluandrea chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT zhangshuang chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT christodoulidesdemetriosn chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem AT chenlin chiraltransmissionbyanopenevolutiontrajectoryinanonhermitiansystem |