Chemically Tuning Room Temperature Pulsed Optically Detected Magnetic Resonance
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915347904331776 |
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| author | Mann, Sarah K. Cowley-Semple, Angus Bryan, Emma Huang, Ziqiu Heutz, Sandrine Attwood, Max Bayliss, Sam L. |
| author_facet | Mann, Sarah K. Cowley-Semple, Angus Bryan, Emma Huang, Ziqiu Heutz, Sandrine Attwood, Max Bayliss, Sam L. |
| contents | Optical detection of magnetic resonance enables spin-based quantum sensing with high spatial resolution and sensitivity-even at room temperature-as exemplified by solid-state defects. Molecular systems provide a complementary, chemically tunable, platform for room-temperature optically detected magnetic resonance (ODMR)-based quantum sensing. A critical parameter governing sensing sensitivity is the optical contrast-i.e., the difference in emission between two spin states. In state-of-the-art solid-state defects such as the nitrogen-vacancy center in diamond, this contrast is approximately 30%. Here, capitalizing on chemical tunability, we show that room-temperature ODMR contrasts of 40% can be achieved in molecules. Using a nitrogen-substituted analogue of pentacene (6,13-diazapentacene), we enhance contrast compared to pentacene and, by determining the triplet kinetics through time-dependent pulsed ODMR, show how this arises from accelerated anisotropic intersystem crossing. Furthermore, we translate high-contrast room-temperature pulsed ODMR to self-assembled nanocrystals. Overall, our findings highlight the synthetic handles available to optically readable molecular spins and the opportunities to capitalize on chemical tunability for room-temperature quantum sensing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_24341 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chemically Tuning Room Temperature Pulsed Optically Detected Magnetic Resonance Mann, Sarah K. Cowley-Semple, Angus Bryan, Emma Huang, Ziqiu Heutz, Sandrine Attwood, Max Bayliss, Sam L. Quantum Physics Chemical Physics Optical detection of magnetic resonance enables spin-based quantum sensing with high spatial resolution and sensitivity-even at room temperature-as exemplified by solid-state defects. Molecular systems provide a complementary, chemically tunable, platform for room-temperature optically detected magnetic resonance (ODMR)-based quantum sensing. A critical parameter governing sensing sensitivity is the optical contrast-i.e., the difference in emission between two spin states. In state-of-the-art solid-state defects such as the nitrogen-vacancy center in diamond, this contrast is approximately 30%. Here, capitalizing on chemical tunability, we show that room-temperature ODMR contrasts of 40% can be achieved in molecules. Using a nitrogen-substituted analogue of pentacene (6,13-diazapentacene), we enhance contrast compared to pentacene and, by determining the triplet kinetics through time-dependent pulsed ODMR, show how this arises from accelerated anisotropic intersystem crossing. Furthermore, we translate high-contrast room-temperature pulsed ODMR to self-assembled nanocrystals. Overall, our findings highlight the synthetic handles available to optically readable molecular spins and the opportunities to capitalize on chemical tunability for room-temperature quantum sensing. |
| title | Chemically Tuning Room Temperature Pulsed Optically Detected Magnetic Resonance |
| topic | Quantum Physics Chemical Physics |
| url | https://arxiv.org/abs/2503.24341 |