Pattern formation and quasicrystal struture in azobenzene polymer film

Pattern formation and transverse effect are reported for azobenzene polymer film. We show, through scanning electron microscopy and polarizing optical microscopy investigation of azobenzene polymer film after being irradiated by degenerate four-wave mixing,that many peak-like islands of azobenzene p olymer molecules array in some patterns. Experimental evidence that it is p ossible to control the photoinduced micro-patterns of the nonlinear organic film via adequately polarized write beams and appropriate power of the wri te beams,thus making easy growth of nanostructures crystals in azobenzene p olymer film.