Seeing the forbidden: overcoming optical selection rules through nanophotonic integration
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866911651864772608 |
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| author | Rubin, Alex H. Žalandauskas, Vytautas Saha, Pranta Poudel, Rubek Teien, Aurora Hofmann, Liam Gonzalez, Nathan R. Dhuey, Scott Bathen, Marianne Etzelmüller Radulaski, Marina |
| author_facet | Rubin, Alex H. Žalandauskas, Vytautas Saha, Pranta Poudel, Rubek Teien, Aurora Hofmann, Liam Gonzalez, Nathan R. Dhuey, Scott Bathen, Marianne Etzelmüller Radulaski, Marina |
| contents | Optically addressable spin defects in silicon carbide, including the neutral divacancy (VV$^0$) and the negative nitrogen-vacancy (NV$^-$), are among leading building blocks of solid-state quantum technologies. Integrating these defects into photonic structures such as nanopillars improves photon collection efficiency, but the consequences extend further. We show that the sub-wavelength geometry of nanopillars drastically modifies the local electromagnetic environment, providing optical access to defect transitions that are otherwise suppressed by selection rules in bulk material. Using low-temperature photoluminescence spectroscopy, we observe that emission from the PL3 divacancy, which is nearly absent in planar devices, becomes pronounced in nanopillars owing to a polarization transformation of the excitation field within the pillar. We further leverage the orientation-dependent collection of nanopillars to resolve the origin of previously ambiguous spectral lines. In particular, the NV4$'$ feature displays the signal enhancement expected for axially oriented NV$^-$ centres, consistent with assignment to a higher excited state of the $kh$ defect configuration. Our results establish nanophotonic integration as a symmetry-sensitive probe that can both activate nominally dark transitions and identify the dipole character of poorly understood defect states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_04277 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Seeing the forbidden: overcoming optical selection rules through nanophotonic integration Rubin, Alex H. Žalandauskas, Vytautas Saha, Pranta Poudel, Rubek Teien, Aurora Hofmann, Liam Gonzalez, Nathan R. Dhuey, Scott Bathen, Marianne Etzelmüller Radulaski, Marina Optics Quantum Physics Optically addressable spin defects in silicon carbide, including the neutral divacancy (VV$^0$) and the negative nitrogen-vacancy (NV$^-$), are among leading building blocks of solid-state quantum technologies. Integrating these defects into photonic structures such as nanopillars improves photon collection efficiency, but the consequences extend further. We show that the sub-wavelength geometry of nanopillars drastically modifies the local electromagnetic environment, providing optical access to defect transitions that are otherwise suppressed by selection rules in bulk material. Using low-temperature photoluminescence spectroscopy, we observe that emission from the PL3 divacancy, which is nearly absent in planar devices, becomes pronounced in nanopillars owing to a polarization transformation of the excitation field within the pillar. We further leverage the orientation-dependent collection of nanopillars to resolve the origin of previously ambiguous spectral lines. In particular, the NV4$'$ feature displays the signal enhancement expected for axially oriented NV$^-$ centres, consistent with assignment to a higher excited state of the $kh$ defect configuration. Our results establish nanophotonic integration as a symmetry-sensitive probe that can both activate nominally dark transitions and identify the dipole character of poorly understood defect states. |
| title | Seeing the forbidden: overcoming optical selection rules through nanophotonic integration |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2605.04277 |