Reconfigurable on-chip vortex beam generation via acoustically stimulated Brillouin nonlinear optical radiation
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914165243772928 |
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| author | Li, Ming Chen, Xiang Duan, Wen-Qi Yang, Yuan-Hao Wang, Jia-Qi Zhang, Mai Xu, Xin-Biao Dong, Chun-Hua Sun, Luyan Guo, Guang-Can Zou, Chang-Ling |
| author_facet | Li, Ming Chen, Xiang Duan, Wen-Qi Yang, Yuan-Hao Wang, Jia-Qi Zhang, Mai Xu, Xin-Biao Dong, Chun-Hua Sun, Luyan Guo, Guang-Can Zou, Chang-Ling |
| contents | The integrated devices that generate structured optical fields with non-trivial orbital angular momentum (OAM) hold great potential for advanced optical applications, but are restricted to complex nanostructures and static functionalities. Here, we demonstrate a reconfigurable OAM beam generator from a simple microring resonator without requiring grating-like nanostructures. Our approach harnesses Brillouin interaction between confined phonon and optical modes, where the acoustic field is excited through microwave input. The phonon stimulate the conversion from a guided optical mode into a free-space vortex beam. Under the selection rule of the radiation, the OAM order of the emitted light is determined by the acousto-optic phase matching and is rapidly reconfigurable by simply tuning the microwave frequency. Furthermore, this all-microwave control scheme allows for the synthesis of arbitrary high-dimensional OAM superpositions by programming the amplitudes and phases of the driving fields. Analytical and numerical models predict a radiation efficiency over 25\% for experimentally feasible on-chip microcavities. This work introduces a novel paradigm for chip-to-free-space interfaces, replacing fixed nanophotonic structures with programmable acousto-optic interactions for versatile structured light generation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_14618 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reconfigurable on-chip vortex beam generation via acoustically stimulated Brillouin nonlinear optical radiation Li, Ming Chen, Xiang Duan, Wen-Qi Yang, Yuan-Hao Wang, Jia-Qi Zhang, Mai Xu, Xin-Biao Dong, Chun-Hua Sun, Luyan Guo, Guang-Can Zou, Chang-Ling Optics The integrated devices that generate structured optical fields with non-trivial orbital angular momentum (OAM) hold great potential for advanced optical applications, but are restricted to complex nanostructures and static functionalities. Here, we demonstrate a reconfigurable OAM beam generator from a simple microring resonator without requiring grating-like nanostructures. Our approach harnesses Brillouin interaction between confined phonon and optical modes, where the acoustic field is excited through microwave input. The phonon stimulate the conversion from a guided optical mode into a free-space vortex beam. Under the selection rule of the radiation, the OAM order of the emitted light is determined by the acousto-optic phase matching and is rapidly reconfigurable by simply tuning the microwave frequency. Furthermore, this all-microwave control scheme allows for the synthesis of arbitrary high-dimensional OAM superpositions by programming the amplitudes and phases of the driving fields. Analytical and numerical models predict a radiation efficiency over 25\% for experimentally feasible on-chip microcavities. This work introduces a novel paradigm for chip-to-free-space interfaces, replacing fixed nanophotonic structures with programmable acousto-optic interactions for versatile structured light generation. |
| title | Reconfigurable on-chip vortex beam generation via acoustically stimulated Brillouin nonlinear optical radiation |
| topic | Optics |
| url | https://arxiv.org/abs/2510.14618 |