Fast response photorefractive guest-host polymer composite

Abstract

A ®lm of composite poly(N-vinylzarbazole): [[4-(dodecanecylmethylamino) phenyl]methylene]-propanedinitrile: C60 was proven to possess attractive photorefractive properties with fast response time. The di raction e ciency was ®tted to the square of a biexponential formula and the fast response time was deduced to be 12 ms at an erasing beam intensity of 1 W/cm 2 . Meanwhile, the strong photorefractive e ect was maintained. An amplitude of index grating as large as 3:1 £ 10 ¡3 at an electric ®eld of 78 V/ mm and ®tted a two-beam coupling gain coe cient of 43 cm ¡1 at 57 V/ mm were observed.