Extremely intrinsic chirality in two-dimensional planar waveguide grating induced by quasi-bound states in the continuum
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917655283236864 |
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| author | Zhang, Dandan Liu, Tingting Lei, Linlin Deng, Weimin Wang, Tongbiao Liao, Qinghua Liu, Wenxing Xiao, Shuyuan Yu, Tianbao |
| author_facet | Zhang, Dandan Liu, Tingting Lei, Linlin Deng, Weimin Wang, Tongbiao Liao, Qinghua Liu, Wenxing Xiao, Shuyuan Yu, Tianbao |
| contents | The strong chiral light-matter interaction is crucial for various important fields such as chiral optics, quantum optics, and biomedical optics, driving a quest for the extreme intrinsic chirality assisted by ultrahigh quality ($Q$-) factor resonances. In this quest, we propose a straightforward method to achieve extreme intrinsic chirality in lossless planar structures by manipulating the quasi-BIC through in-plane perturbation. The temporal coupled-mode theory is employed to derive the conditions necessary for achieving maximal intrinsic chirality. The quasi-BIC should be excited within the transparent spectral range of the structure and couple with $x$- and $y$-polarized waves with the same intensity but a phase difference of $π$/2. For an illustration, a planar chiral dielectric dimeric waveguide grating is designed that strong interacts with left circularly polarized (LCP) light while decouples from right circularly polarized (RCP) light through in-plane symmetry engineering. Furthermore, by adjusting the magnitude of the in-plane asymmetry, we can independently manipulate the $Q$-factors of the chiral quasi-BIC while maintaining nearly unity circular dichroism. Our results provide a simple yet powerful paradigm for achieving extreme intrinsic chirality on an easily manufacturable platform, which may have potential applications in chiral emission, chiral sensing, and enantiomer separation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_15845 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Extremely intrinsic chirality in two-dimensional planar waveguide grating induced by quasi-bound states in the continuum Zhang, Dandan Liu, Tingting Lei, Linlin Deng, Weimin Wang, Tongbiao Liao, Qinghua Liu, Wenxing Xiao, Shuyuan Yu, Tianbao Optics The strong chiral light-matter interaction is crucial for various important fields such as chiral optics, quantum optics, and biomedical optics, driving a quest for the extreme intrinsic chirality assisted by ultrahigh quality ($Q$-) factor resonances. In this quest, we propose a straightforward method to achieve extreme intrinsic chirality in lossless planar structures by manipulating the quasi-BIC through in-plane perturbation. The temporal coupled-mode theory is employed to derive the conditions necessary for achieving maximal intrinsic chirality. The quasi-BIC should be excited within the transparent spectral range of the structure and couple with $x$- and $y$-polarized waves with the same intensity but a phase difference of $π$/2. For an illustration, a planar chiral dielectric dimeric waveguide grating is designed that strong interacts with left circularly polarized (LCP) light while decouples from right circularly polarized (RCP) light through in-plane symmetry engineering. Furthermore, by adjusting the magnitude of the in-plane asymmetry, we can independently manipulate the $Q$-factors of the chiral quasi-BIC while maintaining nearly unity circular dichroism. Our results provide a simple yet powerful paradigm for achieving extreme intrinsic chirality on an easily manufacturable platform, which may have potential applications in chiral emission, chiral sensing, and enantiomer separation. |
| title | Extremely intrinsic chirality in two-dimensional planar waveguide grating induced by quasi-bound states in the continuum |
| topic | Optics |
| url | https://arxiv.org/abs/2401.15845 |