CORRELATION BETWEEN PHOTOCONDUCTIVITY AND HOLOGRAPHIC RESPONSE-TIME IN A PHOTOREFRACTIVE GUEST-HOST POLYMER

The standard model for photorefractivity, which was originally develop ed for inorganic photorefractive crystals, yields a relation between t he pertinent parameters of photoconductivity and the holographic respo nse time. We investigated a photorefractive guest host polymer with re spect to these properties by photoconduction and holographic experimen ts. Our system consists of a photoconducting siloxane polymer, which i s sensitized by trinitrofluorenone, and an azo chromophore as nonlinea r optical moiety. We compare measurements of photoconduction and respo nse time as a function of the external electric field and the incident Light intensity in order to test the applicability of the standard mo del to photorefractive polymers. (C) 1998 Elsevier Science B.V. All ri ghts reserved.