Subsecond grating growth in a photorefractive polymer.
We survey the dynamics of the photorefractive effect in a methyl methacrylate copolymer with the nonlinear chromophore p-nitroaniline in a pendant side group doped with a charge-transport agent, diethylaminobenzaldehyde diphenylhydrazone, a material that represents a new class of photorefractive polymer. The grating growth times are several orders of magnitude smaller than that for the previous epoxy-based photorefractive polymers and fall below 1 s at the highest intensities used. Grating competition and revelation effects suggest that charge carriers other than photogenerated holes are mobile. A sublinear dependence of growth rate on writing intensity implies that shallow traps may also be present.
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S M
SM
Walsh
C A
CA
Scott
J C
JC
Matray
T J
TJ
Twieg
R J
RJ
Hache
F
F
Bjorklund
G C
GC
Moerner
W E
WE