Ordered thin films of organic non-linear optical crystals, 4-(4-dimethylami
nostyryl)-1-methylpyridinium tosylate (DAST), 2-adamantylamino-5-nitroprydi
ne (AANP) and 3-methyl-4-methoxy-4 ' -nitrostilbene (MMONS), have been fabr
icated by a novel simple technique where their microcrystals were dragged o
n the glass plate. Thickness of the ordered thin film was approximately 100
mn. In ordered DAST thin film, ab-plane appeared as their surface layer. T
hey showed dichroism in polarized ultraviolet and visible absorption spectr
a measurements. (C) 2001 Elsevier Science B.V. All rights reserved.