Vectorial microlasers with designable topological charges based on Möbius-like correspondence in quasi-BICs
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914013817864192 |
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| author | Wang, Xinhao Wu, Zhaochen Wang, Jiajun Shi, Lei Zi, Jian |
| author_facet | Wang, Xinhao Wu, Zhaochen Wang, Jiajun Shi, Lei Zi, Jian |
| contents | The ability to control topological properties of laser emission represents a fundamental advancement in photonic technology. Achieving topological laser in a single compact photonic structure is crucial for device integration and miniaturization but faces significant challenges for designing both the high-quality (high-Q) mode and radiative topological configurations. Recently, bound states in the continuum (BICs), as extraordinary states possessing both ultrahigh Q factors and polarization topological charges, have been demonstrated as a promising platform for compact topological lasers. However, as the cornerstone of BIC lasing's non-trivial properties, topological charges of BICs are protected by real-space structural symmetries, which simultaneously impose fundamental limitations that hinder their designability of lasing topological charges. Here, we propose and experimentally demonstrate a compound cavity design method based on the Möbius-like correspondence in quasi-BICs (q-BICs), by which compact vectorial microlasers with designable topological charges can be realized. We reveal the hidden connection between real-space symmetry breaking and eigen-polarizations of q-BICs from the triangular photonic crystal (PhC) slab, manifesting as a Möbius-like correspondence. By splicing PhC slab sectors utilizing this Möbius-like correspondence, we establish a one-to-one correspondence between compound cavities and their lasing topological charges. Vectorial lasing with designable topological charges from $-5$ to $+5$ were experimentally realized. Our work establishes a novel BIC-based platform that enables designable topological lasing, providing a promising route toward compact topological sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_21626 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Vectorial microlasers with designable topological charges based on Möbius-like correspondence in quasi-BICs Wang, Xinhao Wu, Zhaochen Wang, Jiajun Shi, Lei Zi, Jian Optics The ability to control topological properties of laser emission represents a fundamental advancement in photonic technology. Achieving topological laser in a single compact photonic structure is crucial for device integration and miniaturization but faces significant challenges for designing both the high-quality (high-Q) mode and radiative topological configurations. Recently, bound states in the continuum (BICs), as extraordinary states possessing both ultrahigh Q factors and polarization topological charges, have been demonstrated as a promising platform for compact topological lasers. However, as the cornerstone of BIC lasing's non-trivial properties, topological charges of BICs are protected by real-space structural symmetries, which simultaneously impose fundamental limitations that hinder their designability of lasing topological charges. Here, we propose and experimentally demonstrate a compound cavity design method based on the Möbius-like correspondence in quasi-BICs (q-BICs), by which compact vectorial microlasers with designable topological charges can be realized. We reveal the hidden connection between real-space symmetry breaking and eigen-polarizations of q-BICs from the triangular photonic crystal (PhC) slab, manifesting as a Möbius-like correspondence. By splicing PhC slab sectors utilizing this Möbius-like correspondence, we establish a one-to-one correspondence between compound cavities and their lasing topological charges. Vectorial lasing with designable topological charges from $-5$ to $+5$ were experimentally realized. Our work establishes a novel BIC-based platform that enables designable topological lasing, providing a promising route toward compact topological sources. |
| title | Vectorial microlasers with designable topological charges based on Möbius-like correspondence in quasi-BICs |
| topic | Optics |
| url | https://arxiv.org/abs/2508.21626 |