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A perpendicular dual-grating (PDG) guided-mode resonance filter was constructed by placing two identical waveguide gratings close to and their grooves perpendicular to each other. Multilayer waveguide theory was used to estimate the resonant wavelength for the TE and TM polarization incidences, and the rigorous coupled wave analysis (RCWA) was used to investigate the resonant wavelength, the lineshape...
Temperature dependence of the photorefractive effect was investigated in reduced near-stoichiometric LiNbO 3 crystal by a two-wave coupling experiment. An order of magnitude increase in the refractive index change Δn was observed when the crystal temperature was reduced from 35°C to −5°C, and possible corresponding mechanisms are discussed.
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