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Article Dans Une Revue Optics Express Année : 2021

Dark mode-in-the-box for enhanced second-harmonic generation in corrugated waveguides

Anne-Laure Fehrembach
Evgeny Popov
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Herve Tortel
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Antoine Monmayrant
Olivier Gauthier-Lafaye
Stephane Calvez

Résumé

A numerical study of second-harmonic generation (SHG) in cavity resonator integrated grating filters (CRIGFs) shows extraordinary strong conversion rates in planar corrugated waveguides based on Lithium Niobate layers, not exceeding 625 µm in length. The key idea is to couple to the dark mode of the structure at the pump frequency that has a Q-factor much stronger than the bright mode commonly used. This is achieved by shifting the grating coupler between the enclosing Bragg mirrors, resulting in an asymmetric structure. Three asymmetric structures are proposed: without any matching, with impedance matching and with indirect phase matching through an additional pair of gratings. They offer respectively increasing conversion rates of η=4.31x10-3 , 0.149 & 2.38 W-1 , which compared to a symmetric CRIGF (η=7.12x10-6 W-1) offer respectively more than 2, 4 and 5 orders of magnitude improvement of the conversion rate.
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hal-03465128 , version 1 (03-12-2021)

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Anne-Laure Fehrembach, François Renaud, Evgeny Popov, Herve Tortel, Antoine Monmayrant, et al.. Dark mode-in-the-box for enhanced second-harmonic generation in corrugated waveguides. Optics Express, 2021, 29 (25), pp.40981. ⟨10.1364/OE.444054⟩. ⟨hal-03465128⟩
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