Sagnac-Loop-Reflector Fabry-Perot Lattices for Modular 1D Topological Photonics
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866910221126860800 |
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| author | Kim, Siwoo Kim, Yung Choi, Semin Kim, Taeyeon Lee, Seungmin Yu, Kyoungsik Han, Sangyoon Min, Bumki |
| author_facet | Kim, Siwoo Kim, Yung Choi, Semin Kim, Taeyeon Lee, Seungmin Yu, Kyoungsik Han, Sangyoon Min, Bumki |
| contents | We introduce a modular silicon-photonic Fabry-Perot resonator lattice based on cascaded tunable Sagnac loop reflectors. Each SLR is controlled by a single directional-coupler cross-coupling coefficient, enabling modular control of the effective lattice hoppings. As a representative example, alternating two SLR types maps the lattice onto the Su-Schrieffer-Heeger model in the weak-coupling limit. We derive the Bloch dispersion via a transfer-matrix formulation and obtain an effective tight-binding Hamiltonian in the weak-coupling limit. S-parameter simulations of a 20-site lattice show an isolated midgap resonance with edge-localized power profiles in the topological phase, and disorder tests show robustness against symmetry-preserving hopping perturbations. Our results establish SLR-based FP lattices as a complementary platform for on-chip topological photonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_14585 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Sagnac-Loop-Reflector Fabry-Perot Lattices for Modular 1D Topological Photonics Kim, Siwoo Kim, Yung Choi, Semin Kim, Taeyeon Lee, Seungmin Yu, Kyoungsik Han, Sangyoon Min, Bumki Optics We introduce a modular silicon-photonic Fabry-Perot resonator lattice based on cascaded tunable Sagnac loop reflectors. Each SLR is controlled by a single directional-coupler cross-coupling coefficient, enabling modular control of the effective lattice hoppings. As a representative example, alternating two SLR types maps the lattice onto the Su-Schrieffer-Heeger model in the weak-coupling limit. We derive the Bloch dispersion via a transfer-matrix formulation and obtain an effective tight-binding Hamiltonian in the weak-coupling limit. S-parameter simulations of a 20-site lattice show an isolated midgap resonance with edge-localized power profiles in the topological phase, and disorder tests show robustness against symmetry-preserving hopping perturbations. Our results establish SLR-based FP lattices as a complementary platform for on-chip topological photonics. |
| title | Sagnac-Loop-Reflector Fabry-Perot Lattices for Modular 1D Topological Photonics |
| topic | Optics |
| url | https://arxiv.org/abs/2605.14585 |