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Extreme enhancement of the quality (Q)-factor and mode field intensity in cavity-resonator gratings

Abstract : In this paper, dielectric Cavity-Resonant Integrated-Grating Filters (CRIGFs) are numerically optimized to achieve extremely high-quality factors, by optimizing the cavity in/out-coupling rate and by introducing apodizing mode-matching sections to reduce scattering losses. Q-factors ranging between 0.1 and 50 million are obtained and two different domains are distinguished, as a function of the perturbation parameter which controls the cavity in/out-coupling rate. When the cavity coupling Q-factor is lower than the Q-factor of the uncoupled Fabry-Perot cavity, corresponding to the over-coupling regime, the reflectivity response exhibits a high resonance maximum. On the contrary, in the under-coupling regime the resonant reflectivity maximum is much weaker since the scattering losses of the uncoupled cavity dominate. Between these two domains, the so-called critical coupling condition leads to very strong field enhancement inside the device, reaching up to 10^4 times the incident field amplitude. This theoretical work paves the way towards the practical implementation of CRIGFs with much higher Q-factors than currently demonstrated, potentially reaching performance on a par with other resonators such as photonic crystal cavities or whispering gallery mode resonators. These results can serve to optimize the design of narrow-band planar grating filters, particularly for application in non-linear optics.
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https://hal.laas.fr/hal-03718559
Contributor : Stéphane Calvez Connect in order to contact the contributor
Submitted on : Saturday, July 9, 2022 - 12:08:52 AM
Last modification on : Tuesday, October 25, 2022 - 11:58:11 AM
Long-term archiving on: : Monday, October 10, 2022 - 6:01:53 PM

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Evgeny Popov, Elizabeth Hemsley, Anne-Laure Fehrembach, Olivier Gauthier-Lafaye, Antoine Monmayrant, et al.. Extreme enhancement of the quality (Q)-factor and mode field intensity in cavity-resonator gratings. Optics Express, 2022, 30 (14), pp.25390-25399. ⟨10.1364/OE.464695⟩. ⟨hal-03718559⟩

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