Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913281859387392 |
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| author | Tang, Guo-Jing Chen, Xiao-Dong Sun, Lu Guo, Chao-Heng Li, Meng-Yu Tian, Zhong-Tao Chen, Hou-Hong Wang, Hong-Wei Sun, Qi-Yao Pan, Ying-Di He, Xin-Tao Su, Yi-Kai Dong, Jian-Wen |
| author_facet | Tang, Guo-Jing Chen, Xiao-Dong Sun, Lu Guo, Chao-Heng Li, Meng-Yu Tian, Zhong-Tao Chen, Hou-Hong Wang, Hong-Wei Sun, Qi-Yao Pan, Ying-Di He, Xin-Tao Su, Yi-Kai Dong, Jian-Wen |
| contents | 3-dB couplers, which are commonly used in photonic integrated circuits for on-chip information processing, precision measurement, and quantum computing, face challenges in achieving robust performance due to their limited 3-dB bandwidths and sensitivity to fabrication errors. To address this, we introduce topological physics to nanophotonics, developing a framework for topological 3-dB couplers. These couplers exhibit broad working wavelength range and robustness against fabrication dimensional errors. By leveraging valley-Hall topology and mirror symmetry, the photonic-crystal-slab couplers achieve ideal 3-dB splitting characterized by a wavelength-insensitive scattering matrix. Tolerance analysis confirms the superiority on broad bandwidth of 48 nm and robust splitting against dimensional errors of 20 nm. We further propose a topological interferometer for on-chip distance measurement, which also exhibits robustness against dimensional errors. This extension of topological principles to the fields of interferometers, may open up new possibilities for constructing robust wavelength division multiplexing, temperature-drift-insensitive sensing, and optical coherence tomography applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_16538 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes Tang, Guo-Jing Chen, Xiao-Dong Sun, Lu Guo, Chao-Heng Li, Meng-Yu Tian, Zhong-Tao Chen, Hou-Hong Wang, Hong-Wei Sun, Qi-Yao Pan, Ying-Di He, Xin-Tao Su, Yi-Kai Dong, Jian-Wen Optics Applied Physics 3-dB couplers, which are commonly used in photonic integrated circuits for on-chip information processing, precision measurement, and quantum computing, face challenges in achieving robust performance due to their limited 3-dB bandwidths and sensitivity to fabrication errors. To address this, we introduce topological physics to nanophotonics, developing a framework for topological 3-dB couplers. These couplers exhibit broad working wavelength range and robustness against fabrication dimensional errors. By leveraging valley-Hall topology and mirror symmetry, the photonic-crystal-slab couplers achieve ideal 3-dB splitting characterized by a wavelength-insensitive scattering matrix. Tolerance analysis confirms the superiority on broad bandwidth of 48 nm and robust splitting against dimensional errors of 20 nm. We further propose a topological interferometer for on-chip distance measurement, which also exhibits robustness against dimensional errors. This extension of topological principles to the fields of interferometers, may open up new possibilities for constructing robust wavelength division multiplexing, temperature-drift-insensitive sensing, and optical coherence tomography applications. |
| title | Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2403.16538 |