Self-organized spatiotemporal quasi-phase-matching in microresonators
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911964136996864 |
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| author | Zhou, Ji Hu, Jianqi Clementi, Marco Yakar, Ozan Nitiss, Edgars Stroganov, Anton Brès, Camille-Sophie |
| author_facet | Zhou, Ji Hu, Jianqi Clementi, Marco Yakar, Ozan Nitiss, Edgars Stroganov, Anton Brès, Camille-Sophie |
| contents | Quasi-phase-matching (QPM) is a widely adopted technique for mitigating stringent momentum conservation in nonlinear optical processes such as second-harmonic generation (SHG). It effectively compensates for the phase velocity mismatch between optical harmonics by introducing a periodic spatial modulation to the nonlinear optical medium. Such a mechanism has been further generalized to the spatiotemporal domain, where a non-stationary spatial QPM can induce a frequency shift of the generated light. Here we demonstrate how a spatiotemporal QPM grating, consisting in a concurrent spatial and temporal modulation of the nonlinear response, naturally emerges through all-optical poling in silicon nitride microresonators. Mediated by the coherent photogalvanic effect, a traveling space-charge grating is self-organized, affecting momentum and energy conservation, resulting in a quasi-phase-matched and Doppler-shifted second harmonic. Our observation of the photoinduced spatiotemporal QPM expands the scope of phase matching conditions in nonlinear photonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_15587 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Self-organized spatiotemporal quasi-phase-matching in microresonators Zhou, Ji Hu, Jianqi Clementi, Marco Yakar, Ozan Nitiss, Edgars Stroganov, Anton Brès, Camille-Sophie Optics Quasi-phase-matching (QPM) is a widely adopted technique for mitigating stringent momentum conservation in nonlinear optical processes such as second-harmonic generation (SHG). It effectively compensates for the phase velocity mismatch between optical harmonics by introducing a periodic spatial modulation to the nonlinear optical medium. Such a mechanism has been further generalized to the spatiotemporal domain, where a non-stationary spatial QPM can induce a frequency shift of the generated light. Here we demonstrate how a spatiotemporal QPM grating, consisting in a concurrent spatial and temporal modulation of the nonlinear response, naturally emerges through all-optical poling in silicon nitride microresonators. Mediated by the coherent photogalvanic effect, a traveling space-charge grating is self-organized, affecting momentum and energy conservation, resulting in a quasi-phase-matched and Doppler-shifted second harmonic. Our observation of the photoinduced spatiotemporal QPM expands the scope of phase matching conditions in nonlinear photonics. |
| title | Self-organized spatiotemporal quasi-phase-matching in microresonators |
| topic | Optics |
| url | https://arxiv.org/abs/2407.15587 |