Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 40, Issue 4, Pages 727-734Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/40/4/007
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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 second-order 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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