Abstract

A new metastable phase of p-nitroaniline has been formed by flash evaporation from a toluene solution. This phase generates extremely strong second-harmonic radiation at 532 nm when illuminated with a near-infrared laser beam at 1064 nm. This observation is surprising since the stable crystalline phase exhibits no second harmonic and suggests that the new structure lacks a center of symmetry. The second-harmonic intensity decays over several days for the pure compound but remains unchanged over 3 months for the composite with polystyrene. Such nonlinear-optical materials are important for optoelectronic devices such as electro-optic modulators and switches used in telecommunications.

© 1992 Optical Society of America

Phase-matched second-harmonic generation in a 2-methyl-4-nitroaniline single-crystal waveguide: combined structure of grating couplers and four-layer waveguide

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