Optical second harmonic generation in a doubly resonant amorphous silicon nitride microcavity is investigated in both transmission and reflection configurations. Nonlinear conversion efficiency at Fabry–Perot resonant wavelength strongly depends on the angle of incidence due to different spectral overlap of the first- and second-order cavity modes. The maximum efficiency is found for an angle of incidence corresponding to the exact matching of a double resonance condition, as predicted by theory. A significant nonlinear signal is observed in reflection mode at wavelengths corresponding to secondorder stop-band edges. Numerical simulations of the transmitted and reflected second harmonic spectra based on a nonlinear transfer matrix method exhibit good agreement with experimental results by assuming surface nonlinear effects at the multilayer interfaces.
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