Fabrication of photoresponsive liquid-crystalline polymer hologram

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Photoresponsive liquid-crystalline polymer holograms were fabricated and their photoresponsive behaviors were investigated in terms of photoisomerization, photoinduced change in birefringence and photogenerated stress in cross-linked LC polymer films with low azobenzene concentration, in order to quantitatively understand the relationship between their optical and photomechanical properties. The photogenerated stress depended strongly on the initial Young’s modulus of the films, which was affected by the crosslinking density, and also by photoinduced change in birefringence. In addition, significant photoinduced decrease in Young’s modulus (photosoftening) of the films was observed.