Photothermal resistivity alignment of optical fibers to SNSPD
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914415752773632 |
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| author | Baránek, Martin Lorenc, Dušan Ščepka, Tomáš Šoltýs, Ján Vetrova, Iuliia Haščík, Štefan Grajcar, Miroslav Neilinger, Pavol |
| author_facet | Baránek, Martin Lorenc, Dušan Ščepka, Tomáš Šoltýs, Ján Vetrova, Iuliia Haščík, Štefan Grajcar, Miroslav Neilinger, Pavol |
| contents | We demonstrate a straightforward optoelectronic fiber alignment technique for superconducting nanowire single-photon detectors (SNSPDs) that exploits the temperature-dependent resistance of the nanowire under optical absorption. The target nanowire is illuminated via the fiber, and the local absorption of light heats the wire, causing a change in its resistivity. Scanning the fiber over the nanowire, the change in its resistivity is monitored by lock-in amplifier, mapping the spatial photothermal response correlated to absorption and coupling efficiency. The maximum of the response corresponds to optimal fiber-SNSPD alignment. This method allows for aligning the fiber to the center of the meander with sub-micron precision. The response is robust to variations in the angle and height of the fiber, providing an alternative or complement to fiber-to-chip alignment methods based on the back-reflection or transmission measurement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_09498 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Photothermal resistivity alignment of optical fibers to SNSPD Baránek, Martin Lorenc, Dušan Ščepka, Tomáš Šoltýs, Ján Vetrova, Iuliia Haščík, Štefan Grajcar, Miroslav Neilinger, Pavol Instrumentation and Detectors Superconductivity Optics We demonstrate a straightforward optoelectronic fiber alignment technique for superconducting nanowire single-photon detectors (SNSPDs) that exploits the temperature-dependent resistance of the nanowire under optical absorption. The target nanowire is illuminated via the fiber, and the local absorption of light heats the wire, causing a change in its resistivity. Scanning the fiber over the nanowire, the change in its resistivity is monitored by lock-in amplifier, mapping the spatial photothermal response correlated to absorption and coupling efficiency. The maximum of the response corresponds to optimal fiber-SNSPD alignment. This method allows for aligning the fiber to the center of the meander with sub-micron precision. The response is robust to variations in the angle and height of the fiber, providing an alternative or complement to fiber-to-chip alignment methods based on the back-reflection or transmission measurement. |
| title | Photothermal resistivity alignment of optical fibers to SNSPD |
| topic | Instrumentation and Detectors Superconductivity Optics |
| url | https://arxiv.org/abs/2511.09498 |