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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.
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Bian et al. (2000) studied this question.
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