Photoconductivity and grating response time of a photorefractive polymer

Brian E. Jones, Stephen Ducharme, Martin Liphardt, Arosha Goonesekera, James M. Takacs, Lei Zhang, Rajan Athalye

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

We report the photoconductive properties and photorefractive grating response time of a polymer mixture composed of 40-wt. % dissolved diethylamino-benzaldehyde diphenyl hydrazone (DEH) and the non-cross-linking epoxy polymer Bisphenol anitroaminostilbene. The films have improved photoconductive sensitivities as high as (W fi) at a wavelength of 650 nm with a corresponding reduction of the grating response time constant to 0.11 + 0.02 s at an intensity of 1 W/cm2. The nitro-aminostilbene chromophore is deduced to be the source of photogenerated charge carriers on the basis of a comparison of the wavelength dependence of the photoconductivity and absorption coefficient. Degradation of the photoconductivity and the dark conductivity as well as of the photorefractive speed with sample age is attributed to precipitation of the DEH; this explanationis supported by x-ray diffraction observations of crystal growth in the polymer.

Original languageEnglish (US)
Pages (from-to)1064-1072
Number of pages9
JournalJournal of the Optical Society of America B: Optical Physics
Volume11
Issue number6
DOIs
StatePublished - Jun 1994

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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