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Large Photoinduced Birefringence in Azo Dye/Polyion Films Assembled by Electrostatic Sequential Adsorption
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2000
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EngineeringStable Photoinduced BirefringenceisPhoto-electrochemical CellChemistryOptical PropertiesPolarization-selective DegradationPhotopolymer NetworkDyeingElectrostatic Sequential AdsorptionPhotophysical PropertyMaterials SciencePhotochemistryPolarization ImagingPhotochromismOrganic Charge-transfer CompoundApplied PhysicsThin FilmsLarge Photoinduced BirefringenceOptoelectronics
Large and stable photoinduced birefringenceis observed in thin films of Congo red (CR, see Figure) and poly(dimethyldiallylammonium chloride) (PDAC, see Figure), fabricated by electrostatic sequential absorption. Investigations indicate that only a small contribution to the birefringence is from photoinduced alignment of the azobenzene chromophores, the larger contribution being attributed to polarization-selective degradation.