Phase Matching in presence of feedback: Higher order terms and enhancement of nonlinear interactions
نویسنده
چکیده
Our study shows that higher terms in phase matching conditions, usually neglected, can in fact drastically affect the dynamics in distributed feedback gratings. We showed that phase matching conditions and standard Bloch theory are totally inadequate to predict optimum second harmonic generation when fields’ overlap and localization effects rule the nonlinear dynamics. We designed an optimized structure based on GaN/AlN stacks for second harmonic generation in the visible range. We also designed an optimised structure based on AlGaAs/AlAs stacks for second harmonic generation in the near infrared range. Our numerical predictions show that the efficiency/size performances have been improved by one order of magnitude with respect to phased matched interactions in similar structures.
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