Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories
Bound states in the continuum (BICs) in planar photonic structures have attracted broad scientific interest owing to their exceptional capability to confine light. Topological robustness of certain BICs allows them to be moved in the momentum space by tuning the geometric parameters of the structure...
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IOP Publishing
2025-01-01
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| Series: | JPhys Photonics |
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| Online Access: | https://doi.org/10.1088/2515-7647/add1a1 |
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| author | Huayu Bai Andriy Shevchenko Radoslaw Kolkowski |
| author_facet | Huayu Bai Andriy Shevchenko Radoslaw Kolkowski |
| author_sort | Huayu Bai |
| collection | DOAJ |
| description | Bound states in the continuum (BICs) in planar photonic structures have attracted broad scientific interest owing to their exceptional capability to confine light. Topological robustness of certain BICs allows them to be moved in the momentum space by tuning the geometric parameters of the structure. In this work, we study such a BIC in a one-dimensional periodic grating, and find that its momentum-space position can be made a non-monotonic function of a geometric parameter, forming a locally bent V-shaped trajectory. We show that, near the turning point of this trajectory, the robustness of the BIC and its Q factor can be greatly enhanced. We tune such ‘V-BICs’ to almost merge with a symmetry-protected BIC at the Γ-point. This creates a K-shaped ultrahigh- Q region containing a BIC with a much higher and more stable Q factor compared to the ordinary merging BICs. The ‘K-BICs’ are also found to provide a strong enhancement of the Q factor in finite gratings over an extremely wide range of geometric parameters. Our findings enable further advancements in the development of ultrahigh- Q BICs and their applications. |
| format | Article |
| id | doaj-art-2a85f9eb5c8c4288aaa0366cd679a93d |
| institution | OA Journals |
| issn | 2515-7647 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | JPhys Photonics |
| spelling | doaj-art-2a85f9eb5c8c4288aaa0366cd679a93d2025-08-20T02:14:42ZengIOP PublishingJPhys Photonics2515-76472025-01-017303LT0110.1088/2515-7647/add1a1Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectoriesHuayu Bai0https://orcid.org/0000-0003-2046-9650Andriy Shevchenko1https://orcid.org/0000-0002-7621-2830Radoslaw Kolkowski2https://orcid.org/0000-0003-3866-9394Department of Applied Physics, Aalto University , PO Box 13500, Aalto FI-00076, FinlandDepartment of Applied Physics, Aalto University , PO Box 13500, Aalto FI-00076, FinlandDepartment of Applied Physics, Aalto University , PO Box 13500, Aalto FI-00076, FinlandBound states in the continuum (BICs) in planar photonic structures have attracted broad scientific interest owing to their exceptional capability to confine light. Topological robustness of certain BICs allows them to be moved in the momentum space by tuning the geometric parameters of the structure. In this work, we study such a BIC in a one-dimensional periodic grating, and find that its momentum-space position can be made a non-monotonic function of a geometric parameter, forming a locally bent V-shaped trajectory. We show that, near the turning point of this trajectory, the robustness of the BIC and its Q factor can be greatly enhanced. We tune such ‘V-BICs’ to almost merge with a symmetry-protected BIC at the Γ-point. This creates a K-shaped ultrahigh- Q region containing a BIC with a much higher and more stable Q factor compared to the ordinary merging BICs. The ‘K-BICs’ are also found to provide a strong enhancement of the Q factor in finite gratings over an extremely wide range of geometric parameters. Our findings enable further advancements in the development of ultrahigh- Q BICs and their applications.https://doi.org/10.1088/2515-7647/add1a1bound states in the continuumphotonic crystalstopological photonicsQ factor |
| spellingShingle | Huayu Bai Andriy Shevchenko Radoslaw Kolkowski Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories JPhys Photonics bound states in the continuum photonic crystals topological photonics Q factor |
| title | Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories |
| title_full | Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories |
| title_fullStr | Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories |
| title_full_unstemmed | Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories |
| title_short | Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories |
| title_sort | enhanced q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories |
| topic | bound states in the continuum photonic crystals topological photonics Q factor |
| url | https://doi.org/10.1088/2515-7647/add1a1 |
| work_keys_str_mv | AT huayubai enhancedqfactorandrobustnessofphotonicboundstatesinthecontinuummergingatlocallybenttrajectories AT andriyshevchenko enhancedqfactorandrobustnessofphotonicboundstatesinthecontinuummergingatlocallybenttrajectories AT radoslawkolkowski enhancedqfactorandrobustnessofphotonicboundstatesinthecontinuummergingatlocallybenttrajectories |