Observation of the Photorefractive Effect in a Polymer
Interim technical rept.
IBM ALMADEN RESEARCH CENTER SAN JOSE CA
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We report the observation of the photorefractive effect in an amorphous electro-optic material, the nonlinear polymer bisphenol A diglycidyl ether 4-nitro-1,2,phenylenediamine bisA-NPDA make photoconductive by doping with the hole transport agent diethylaminobenzaldehyde-diphenyl hydrazone DEH. The gratings formed exhibit dynamic writing and erasure, strong electric field dependence, polarization anisotropy, diffraction efficiencies up to 6 x 10 -5 in a 356 micron film, and large estimated photorefractive space-charge fields. Continuous realignment of the nonlinear molecules in the polymer permits external control of the grating readout independent of the space charge field formed.
- Polymer Chemistry