Critical coupling in cavity-resonant integrated-grating filters (CRIGFs) - LAAS - Laboratoire d'Analyse et d'Architecture des Systèmes
Journal Articles Optics Express Year : 2023

Critical coupling in cavity-resonant integrated-grating filters (CRIGFs)

Elizabeth Hemsley
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  • PersonId : 1130436
Olivier Gauthier-Lafaye
Antoine Monmayrant
Stéphane Calvez
Anne-Laure Fehrembach
Evgeny Popov
  • Function : Author

Abstract

We experimentally demonstrate critical coupling in miniature grating-coupled resonators known as cavity-resonant integrated-grating filters (CRIGFs). Using previously proposed asymmetric grating coupler designs for non-linear CRIGFs, and introducing a dedicated variant of a coupled-modes theory model to estimate physical properties out of the measured reflection and transmission characteristics of these resonators, we demonstrate fine control over the in-and out-coupling rate to the resonator while keeping constant both the internal losses and the resonant wavelength. Furthermore, the critical coupling condition is also observed to coincide with the maximum enhancement of the second harmonic generation signal.
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Dates and versions

hal-04174761 , version 1 (01-08-2023)

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Elizabeth Hemsley, Olivier Gauthier-Lafaye, Antoine Monmayrant, Pascal Dubreuil, Stéphane Calvez, et al.. Critical coupling in cavity-resonant integrated-grating filters (CRIGFs). Optics Express, 2023, 31 (17), pp.27274. ⟨10.1364/oe.498125⟩. ⟨hal-04174761⟩
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