Abstract
Noncollinear generation of second and third harmonics in three-dimensional photonic crystals of artificial opals is experimentally realized and interpreted in terms of nonlinear diffraction. A factor-of-two enhancement of second- and third-harmonic generation intensity in diffraction maxima directions is observed due to effective phase matching provided by photonic crystal periodicity. Bidirectional diffraction of third harmonics at crystallographic planes and is observed. The broadening of nonspecular diffraction peaks is found to correspond to the polycrystalline structure of the opal samples.
© 2011 Optical Society of America
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