Phase-matched second-harmonic generation in hybrid polymer-LN waveguides |
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Affiliation: | 1. School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China;2. School of Electrical Engineering and Intelligentization, Dongguan University of Technology, Dongguan 523808, China;3. China-Singapore International Joint Research Institute, Guangzhou Knowledge City, Guangzhou 510663, China |
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Abstract: | Here we propose a hybrid polymer-LN waveguide for achieving phase-matched second-harmonic generation (SHG). From the aspect of super-mode theory, the geometric parameters of the hybrid semi-nonlinear waveguide were optimized to utilize both symmetric (even) and antisymmetric (odd) modes of the pump and SHG waves so as to facilitate phase matching with large modal overlap. Phase matching between a fundamental even (TE00-like) mode at 1320 nm and a fundamental odd (TE01-like) mode at 660 nm was found with a calculated modal overlap integral of 0.299, while utilizing the largest nonlinear coefficient d33, and achieving an efficient calculated normalized conversion efficiency of 148% W-1·cm-2. Considering the fabrication feasibility of such hybrid waveguide with features including etchless, large dimension, and low structural sensitivity, we believe our findings would provide a useful reference for future on-chip efficient nonlinear conversion devices. |
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Keywords: | nonlinear waveguides super-mode theory phase matching second harmonic generation |
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