Patent ID: 7985356

Claim:
A method for modulating light, comprising the steps of: providing a photorefractive composition consisting essentially of a chromophore and a polymer, wherein the polymer comprises a repeating unit that includes a moiety selected from the group consisting of the following structures: wherein each Q in (M-2) and (M-3) independently represents an unsubstituted or substituted alkylene group; wherein Rb 1 -Rb 27 and Rc 1 -Rc 14 in (M-2) and (M-3) are each independently selected from the group consisting of hydrogen, C 1 -C 10 alkyl, C 4 -C 10 aryl and C 4 -C 10 heteroaryl; wherein the chromophore and the polymer are together selected to render the composition photorefractive upon irradiation by a green laser; wherein the chromophore is 4-homopiperidino-2-fluorobenzylidene malononitrile; and irradiating the photorefractive composition with a green laser to thereby modulate a photorefractive property of the polymer.