Saturable absorption in diamond nanophotonics
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866912962379251712 |
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| author | Coutts, Christopher Sorensen, Nicholas J. Zohari, Elham McNaney, Sean Flågan, Sigurd Barclay, Paul E. |
| author_facet | Coutts, Christopher Sorensen, Nicholas J. Zohari, Elham McNaney, Sean Flågan, Sigurd Barclay, Paul E. |
| contents | Diamond is a leading quantum photonics platform due to its ability to host qubits based on crystal defects such as nitrogen vacancy centres. Fabricating nanophotonic devices from defect-rich diamond, which is central to many quantum sensing technologies, promises to enable enhanced performance and integrability of diamond quantum sensors. Here we demonstrate microdisk cavities fabricated from defect-rich diamond that support optical modes with high quality factor ($Q\sim7\times10^4$ at 1042 nm), and show that they exhibit saturable absorption. Power dependent spectroscopy measurements spanning 979 nm to 1604 nm are used to extract wavelength-dependent absorption coefficients and saturation intensities, which indicate that a hydrogen-related defect is a likely origin of the observed absorption. At 1047 nm, we measure a saturation intensity of 3.3 (1) MW/cm$^2$ and an absorption coefficient of 0.537 (4) cm$^{-1}$. These results provide insight into defect-mediated optical loss in diamond nanophotonics and suggest strategies to harness defect-induced nonlinearities in future diamond photonic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11367 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Saturable absorption in diamond nanophotonics Coutts, Christopher Sorensen, Nicholas J. Zohari, Elham McNaney, Sean Flågan, Sigurd Barclay, Paul E. Optics Quantum Physics Diamond is a leading quantum photonics platform due to its ability to host qubits based on crystal defects such as nitrogen vacancy centres. Fabricating nanophotonic devices from defect-rich diamond, which is central to many quantum sensing technologies, promises to enable enhanced performance and integrability of diamond quantum sensors. Here we demonstrate microdisk cavities fabricated from defect-rich diamond that support optical modes with high quality factor ($Q\sim7\times10^4$ at 1042 nm), and show that they exhibit saturable absorption. Power dependent spectroscopy measurements spanning 979 nm to 1604 nm are used to extract wavelength-dependent absorption coefficients and saturation intensities, which indicate that a hydrogen-related defect is a likely origin of the observed absorption. At 1047 nm, we measure a saturation intensity of 3.3 (1) MW/cm$^2$ and an absorption coefficient of 0.537 (4) cm$^{-1}$. These results provide insight into defect-mediated optical loss in diamond nanophotonics and suggest strategies to harness defect-induced nonlinearities in future diamond photonic devices. |
| title | Saturable absorption in diamond nanophotonics |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2603.11367 |