Pattern formation and quasicrystal structure in azobenzene polymer film

Pattern formation in azobenzene polymer film by degenerate four-wave mixing is reported. Island arrays with specific patterns are analyzed with scanni ng electron microscopy and polarizing optical microscopy. It is demonstrate d that the control of photo-induced nanostructure sized micropattern in the nonlinear organic film is possible by using properly polarized writing bea ms with the total incident power exceeding a certain threshold.