Full Polarization Control of Photons with Evanescent Wave Coupling in the Ultra Subwavelength Gap of Photonic Molecules
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915188333084672 |
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| author | Zhu, Rui Qian, Chenjiang Xiao, Shan Yang, Jingnan Yan, Sai Liu, Hanqing Dai, Deyan Li, Hancong Yang, Longlong Chen, Xiqing Yuan, Yu Dai, Danjie Zuo, Zhanchun Ni, Haiqiao Niu, Zhichuan Wang, Can Jin, Kuijuan Gong, Qihuang Xu, Xiulai |
| author_facet | Zhu, Rui Qian, Chenjiang Xiao, Shan Yang, Jingnan Yan, Sai Liu, Hanqing Dai, Deyan Li, Hancong Yang, Longlong Chen, Xiqing Yuan, Yu Dai, Danjie Zuo, Zhanchun Ni, Haiqiao Niu, Zhichuan Wang, Can Jin, Kuijuan Gong, Qihuang Xu, Xiulai |
| contents | Polarization of photons plays a key role in quantum optics and light-matter interactions, however, it is difficult to control in nanosystems since the eigenstate of a nanophotonic cavity is usually fixed and linearly polarized. Here we reveal polarization control of photons using photonic molecules (PMs) that host supermodes of two coupled nanobeam cavities. In contrast to conventional PMs in a 2D photonic crystal slab, for the two 1D photonic crystal nanobeam cavities the shift and gap between them can be tuned continuously. With an ultra subwavelength gap, the coupling between the two cavities is dominated by the evanescent wave coupling in the surrounding environment, rather not the emission wave coupling for conventional PMs. As such, non-Hermiticity of the system becomes pronounced, and the supermodes consist of a non-trivial phase difference between bare eigenstates that supports elliptical polarization. We observe that both the polarization degree and polarization angle of the antisymmetric mode strongly depend on the shift and gap between the two cavities, exhibiting polarization states from linear to circular. This full polarization control indicates great potential of PMs in quantum optical devices and spin-resolved cavity quantum electrodynamics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_06513 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Full Polarization Control of Photons with Evanescent Wave Coupling in the Ultra Subwavelength Gap of Photonic Molecules Zhu, Rui Qian, Chenjiang Xiao, Shan Yang, Jingnan Yan, Sai Liu, Hanqing Dai, Deyan Li, Hancong Yang, Longlong Chen, Xiqing Yuan, Yu Dai, Danjie Zuo, Zhanchun Ni, Haiqiao Niu, Zhichuan Wang, Can Jin, Kuijuan Gong, Qihuang Xu, Xiulai Optics Polarization of photons plays a key role in quantum optics and light-matter interactions, however, it is difficult to control in nanosystems since the eigenstate of a nanophotonic cavity is usually fixed and linearly polarized. Here we reveal polarization control of photons using photonic molecules (PMs) that host supermodes of two coupled nanobeam cavities. In contrast to conventional PMs in a 2D photonic crystal slab, for the two 1D photonic crystal nanobeam cavities the shift and gap between them can be tuned continuously. With an ultra subwavelength gap, the coupling between the two cavities is dominated by the evanescent wave coupling in the surrounding environment, rather not the emission wave coupling for conventional PMs. As such, non-Hermiticity of the system becomes pronounced, and the supermodes consist of a non-trivial phase difference between bare eigenstates that supports elliptical polarization. We observe that both the polarization degree and polarization angle of the antisymmetric mode strongly depend on the shift and gap between the two cavities, exhibiting polarization states from linear to circular. This full polarization control indicates great potential of PMs in quantum optical devices and spin-resolved cavity quantum electrodynamics. |
| title | Full Polarization Control of Photons with Evanescent Wave Coupling in the Ultra Subwavelength Gap of Photonic Molecules |
| topic | Optics |
| url | https://arxiv.org/abs/2503.06513 |