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

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 mode...

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Published in:Optics express 2023-08, Vol.31 (17), p.27274
Main Authors: Hemsley, Elizabeth, Gauthier-Lafaye, Olivier, Monmayrant, Antoine, Dubreuil, Pascal, Calvez, Stéphane, Fehrembach, Anne-Laure, Popov, Evgeny
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Physics
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container_issue 17
container_start_page 27274
container_title Optics express
container_volume 31
creator Hemsley, Elizabeth
Gauthier-Lafaye, Olivier
Monmayrant, Antoine
Dubreuil, Pascal
Calvez, Stéphane
Fehrembach, Anne-Laure
Popov, Evgeny
description 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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title Critical coupling in cavity-resonant integrated-grating filters (CRIGFs)
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