Abstract
We theoretically analyse quasi-phase matched second harmonic generation in a quadratic slot waveguide. Our results show that in this system both fundamental frequency and second harmonic (SH) modes can be confined in a nano-sized low-index region with the mode overlap integral intensity two orders larger than that achieved in the form birefringence phase matching slot waveguide and the conventional quasi-phase matched waveguide. For the unity length of 1.0 mm, the SH in the novel waveguide can be one order larger than those which have been investigated.
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