Response Time Characteristics and Holographic Gratings in an Azo-Dye Doped Photorefractive Polymeric Composite

摘要

Theoretical and experimental investigation on the applied electric field-and intensity-dependent photorefractive response in a photorefractive polymeric composite is presented.The decay time constant and the corresponding grating-amplitude for the composite consisting of 1-n-butoxy1-2,5-dimethy1-4-(4’-nitrophenylazo)benzene:poly(N-vinylcarbazole):2,4,7-trinitro-9-fluorenone with a weight ratio 44:55:1 were measured.The results revealed that there existed two gratings simultaneously,one was caused by the photorefractive effect,and the other was contributed from the photo-isomerization process.The dynamic process for the photorefractive grating was explained with a modified band transport model.