The rapid formation (and erasure) of a dynamic phase grating is one condition required of materials for dynamic holography. The photochemical nematic–isotropic transition of the side-chain polymer liquid crystal (PLC) shown in the Figure, caused by the trans–cis photoisomerization of the azobenzene moiety, is reported to cause a dynamic grating with fringe spacing of 1.4 μm to form in ∼150 ms.
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Hasegawa et al. (1999) studied this question.