Fig. 1. （a） Photoisomerization of azobenzene groups； （b） Order-order and order-disorder transitions induced by photochemical processes； （c） Effect of the molecular alignment in azobenzene polymer films on the bending behaviors.

Fig. 2. （a） Photodimerization of coumarins， the photoisomerization photodimerization of cinnamates and chalcones； （b） Photodegradation of polyimides.

Fig. 3. （a） Polarized light-driven directional bending of thin films^［25］； （b） Light-driven oscillation of the liquid crystal network^［43］； （c） Bending motion of a polymer containing the azobenzenamine crosslinker under linear polarized light^［44］； （d） Polarized bending and triple-memory properties of dynamic ester-bonded liquid crystal network （autonomous opening and closing of cardboard boxes）^［45］.

Fig. 4. （a） Motions of a liquid crystal elastomer film driven by polarized light through a rotating polarizer^［46］； （b） Alignment and drive mode of an accordion actuator^［47］； （c） Polarized bending and patterning three-dimensional deformations of a chalcone-containing liquid crystal elastomer^［49］.

Fig. 5. （a） Manipulating the programmable structures of polymer films， molecular motors in liquid crystal networks by photolithography^［50］； （b） Photothermal effect-based liquid crystal elastomers driven by polarized light in the form of bionic dogtails and light lightweight light mills^［51］； （c） Bending behavior of liquid crystal elastomers driven by circularly polarized light^［52］.