Topological bound states in the continuum in a non-Hermitian photonic system
Topological insulators and bound states in the continuum represent two fascinating topics in the optical and photonic domain. The exploration of their interconnection and potential applications has emerged as a current research focus. Here, we investigated non-Hermitian photonics based on a parallel...
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| Format: | Article |
| Language: | English |
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De Gruyter
2025-01-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2024-0419 |
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| author | Luo Yihao Sun Xiankai |
| author_facet | Luo Yihao Sun Xiankai |
| author_sort | Luo Yihao |
| collection | DOAJ |
| description | Topological insulators and bound states in the continuum represent two fascinating topics in the optical and photonic domain. The exploration of their interconnection and potential applications has emerged as a current research focus. Here, we investigated non-Hermitian photonics based on a parallel cascaded-resonator system, where both direct and indirect coupling between adjacent resonators can be independently manipulated. We observed the emergence of topological Fabry−Pérot bound states in the continuum in this non-Hermitian system, and theoretically validated its robustness. We also observed topological phase transitions and exceptional points in the same system. By elucidating the relationship between topological insulators and bound states in the continuum, this work will enable various applications that harness the advantages of bound states in the continuum, exceptional points, and topology. These applications may include optical delay and storage, highly robust optical devices, high-sensitivity sensing, and chiral mode switching. |
| format | Article |
| id | doaj-art-430da381a33b4805a677ed68d71610e6 |
| institution | Kabale University |
| issn | 2192-8614 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-430da381a33b4805a677ed68d71610e62025-02-02T15:46:12ZengDe GruyterNanophotonics2192-86142025-01-01141435010.1515/nanoph-2024-0419Topological bound states in the continuum in a non-Hermitian photonic systemLuo Yihao0Sun Xiankai1Department of Electronic Engineering, 26451The Chinese University of Hong Kong, Shatin, New Territories, Hong KongDepartment of Electronic Engineering, 26451The Chinese University of Hong Kong, Shatin, New Territories, Hong KongTopological insulators and bound states in the continuum represent two fascinating topics in the optical and photonic domain. The exploration of their interconnection and potential applications has emerged as a current research focus. Here, we investigated non-Hermitian photonics based on a parallel cascaded-resonator system, where both direct and indirect coupling between adjacent resonators can be independently manipulated. We observed the emergence of topological Fabry−Pérot bound states in the continuum in this non-Hermitian system, and theoretically validated its robustness. We also observed topological phase transitions and exceptional points in the same system. By elucidating the relationship between topological insulators and bound states in the continuum, this work will enable various applications that harness the advantages of bound states in the continuum, exceptional points, and topology. These applications may include optical delay and storage, highly robust optical devices, high-sensitivity sensing, and chiral mode switching.https://doi.org/10.1515/nanoph-2024-0419bound states in the continuumtopological photonicsnon-hermitian photonicsintegrated photonics |
| spellingShingle | Luo Yihao Sun Xiankai Topological bound states in the continuum in a non-Hermitian photonic system Nanophotonics bound states in the continuum topological photonics non-hermitian photonics integrated photonics |
| title | Topological bound states in the continuum in a non-Hermitian photonic system |
| title_full | Topological bound states in the continuum in a non-Hermitian photonic system |
| title_fullStr | Topological bound states in the continuum in a non-Hermitian photonic system |
| title_full_unstemmed | Topological bound states in the continuum in a non-Hermitian photonic system |
| title_short | Topological bound states in the continuum in a non-Hermitian photonic system |
| title_sort | topological bound states in the continuum in a non hermitian photonic system |
| topic | bound states in the continuum topological photonics non-hermitian photonics integrated photonics |
| url | https://doi.org/10.1515/nanoph-2024-0419 |
| work_keys_str_mv | AT luoyihao topologicalboundstatesinthecontinuuminanonhermitianphotonicsystem AT sunxiankai topologicalboundstatesinthecontinuuminanonhermitianphotonicsystem |