Organic microcrystals for linear and nonlinear optics

Crystalline materials always provide us with the best performance. This is also the case of organic optical materials. Their device fabrication, however, is one of the big issues. Recently we have demonstrated that organic microcrystals can easily be prepared by a reprecipitation method, and the resulting dispersion, not only the liquid dispersion but also the polymer-embedded dispersion, gives materials having optical quality acceptable for device performance evaluation. In addition, some peculiar size-dependant properties for organic microcrystals compared with semiconductors or metals have also been found. Recent progress in our studies is introduced.