Shape Controlled Crystal Growth of Organic Nonlinear Optical Material DAST
Muneo YOSHIDA, Kyoji KOMATSU*, Shinji ONODERA and Toshikuni KAINO
Institute for Chemical Reaction Science, Tohoku University; 2-1-1 Katahira, Aoba-ku, Sendai-shi 980-8577 Japan
In recent years, organic nonlinear optical materials have become of considerable interest for potential applications in optoelectronics. An organic salt 4-(4-dimethylaminostyryl)-1-methylpyridinium tosylate (DAST) crystal has extremely large optical nonlinearities and is a promising material for optical switching and frequency conversion. DAST crystal grown in b direction with sufficient length is necessary to utilize the largest electro-optic coefficient r11 and the crystal should take waveguide structure in order to fabricate highly efficient optical devices.
In methanol solution, growth rate of  direction of DAST crystal is faster than that of [-100] direction and growth rate of  direction is faster than that of [00-1] direction. In this paper, crystal growth from a seed crystal was performed by temperature lowering method and the crystal with ridge structure parallel to b axis was grown successfully by using a substrate with a grooved structure and applying the growth behavior of the crystal.
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