Broadband spectral mapping of photo-induced second-harmonic generation in silicon nitride microresonators
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912632601051136 |
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| author | Zhou, Ji Clementi, Marco Sbarra, Samantha Yakar, Ozan Brès, Camille-Sophie |
| author_facet | Zhou, Ji Clementi, Marco Sbarra, Samantha Yakar, Ozan Brès, Camille-Sophie |
| contents | By employing a pump-probe technique for enhanced spectral mapping of the dynamics in nonlinear frequency conversion, we demonstrate that photo-induced second-harmonic generation (SHG) in silicon nitride (Si3N4) microresonators can persist when transitioning from the preferred doubly resonant condition--where the resonances of the optical harmonics are required to be matched--to a highly detuned state where the generated second harmonic is significantly shifted away from its corresponding resonance. This results in an unconventionally broad conversion bandwidth. Other intriguing phenomena, such as detuning-dependent all-optical poling and nonlinear multi-mode interaction, are also presented for the first time with direct experimental evidence. Our findings provide new insights into the physics of photo-induced second-order (χ^{(2)}) nonlinearity, highlighting its potential applications for nonlinear χ^{(2)} photonics in integrated Si3N4 platform |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_05636 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broadband spectral mapping of photo-induced second-harmonic generation in silicon nitride microresonators Zhou, Ji Clementi, Marco Sbarra, Samantha Yakar, Ozan Brès, Camille-Sophie Optics By employing a pump-probe technique for enhanced spectral mapping of the dynamics in nonlinear frequency conversion, we demonstrate that photo-induced second-harmonic generation (SHG) in silicon nitride (Si3N4) microresonators can persist when transitioning from the preferred doubly resonant condition--where the resonances of the optical harmonics are required to be matched--to a highly detuned state where the generated second harmonic is significantly shifted away from its corresponding resonance. This results in an unconventionally broad conversion bandwidth. Other intriguing phenomena, such as detuning-dependent all-optical poling and nonlinear multi-mode interaction, are also presented for the first time with direct experimental evidence. Our findings provide new insights into the physics of photo-induced second-order (χ^{(2)}) nonlinearity, highlighting its potential applications for nonlinear χ^{(2)} photonics in integrated Si3N4 platform |
| title | Broadband spectral mapping of photo-induced second-harmonic generation in silicon nitride microresonators |
| topic | Optics |
| url | https://arxiv.org/abs/2510.05636 |