Giant Brillouin gain in frozen CS2 capillaries
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866910075727118336 |
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| author | Seiderer, Simon Geilen, Andreas Sliwa, Luan N. Gan, Linqiao Qi, Xue Chemnitz, Mario Schmidt, Markus A. Stiller, Birgit |
| author_facet | Seiderer, Simon Geilen, Andreas Sliwa, Luan N. Gan, Linqiao Qi, Xue Chemnitz, Mario Schmidt, Markus A. Stiller, Birgit |
| contents | Stimulated Brillouin-Mandelstam scattering offers exceptional capabilities for photonic signal processing, but current platforms demand performance trade-offs between long interaction lengths, high gain, low optical losses, and practical implementation. Here, we demonstrate a novel platform based on the reversible freezing of a carbon disulfide filled liquid-core optical fiber. This approach delivers a giant in-fiber Brillouin gain of 434 W-1m-1 with a linewidth of 24 MHz, while maintaining low propagation losses in a fully spliced architecture and providing the potential for meter-scale interaction lengths. Leveraging this gain, as a proof of principle, we realize an optoacoustic memory operating at sub-nanojoule pulse energies - more than two orders of magnitude lower than state-of-the-art implementations. This power reduction is universal for Brillouin-based fiber applications in general and will enable low-power photonic signal processing and neuromorphic computing, efficient microwave photonics and sensing, as well as in-fiber quantum optomechanics-based technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_25472 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Giant Brillouin gain in frozen CS2 capillaries Seiderer, Simon Geilen, Andreas Sliwa, Luan N. Gan, Linqiao Qi, Xue Chemnitz, Mario Schmidt, Markus A. Stiller, Birgit Optics Stimulated Brillouin-Mandelstam scattering offers exceptional capabilities for photonic signal processing, but current platforms demand performance trade-offs between long interaction lengths, high gain, low optical losses, and practical implementation. Here, we demonstrate a novel platform based on the reversible freezing of a carbon disulfide filled liquid-core optical fiber. This approach delivers a giant in-fiber Brillouin gain of 434 W-1m-1 with a linewidth of 24 MHz, while maintaining low propagation losses in a fully spliced architecture and providing the potential for meter-scale interaction lengths. Leveraging this gain, as a proof of principle, we realize an optoacoustic memory operating at sub-nanojoule pulse energies - more than two orders of magnitude lower than state-of-the-art implementations. This power reduction is universal for Brillouin-based fiber applications in general and will enable low-power photonic signal processing and neuromorphic computing, efficient microwave photonics and sensing, as well as in-fiber quantum optomechanics-based technologies. |
| title | Giant Brillouin gain in frozen CS2 capillaries |
| topic | Optics |
| url | https://arxiv.org/abs/2603.25472 |