Fig. 1. （a） Principle of photo-electric stimulation response of the Ch_OH LC system； （b） Molecular structures of the components used in the LC system.

Fig. 2. Schematic diagram of the preparation of double-layer Ch_OH LC devices with high reflectivity （E₁ > E₂）

Fig. 3. （a） Z/E photoisomerization of switch 1 upon the irradiations of 450 nm blue light； （b） The mechanism of helical inversion in LC system； （c） POM images of the CLCs formed by doping 1.0% （mass fraction） switch 1 and 2.06% （mass fraction） R811 into 5CB in the wedge cell and in vertically oriented cell under 450 nm illumination.

Fig. 4. CD spectra of CLC formed by doping 1.0% （mass fraction）switch 1 and 2.06% （mass fraction） R811 into 5CB

Fig. 5. Reflectance spectra at 1.40 V/μm， 1.30 V/μm and 1.15 V/μm for （a） the initial state and （b） PSS₄₅₀ of the Ch_OH LC system.

Fig. 6. （a～c） Spectra of right-handed （R， dotted line） and left-handed （L， solid line） circularly polarized reflection spectra of the Ch_OH LC system measured by right-handed and left-handed circular polarizers， respectively； （d） Physical photographs of the photoresponsive Ch_OH LC system obtained without polarizer， with left-hand circular polarizer and with right-hand circular polarizer under electric field modulation at the initial state.

Fig. 7. （a～c） Spectra of right-handed （R， dotted line） and left-handed （L， solid line） circularly polarized reflection spectra of the Ch_OH LC system measured by right-handed and left-handed circular polarizers， respectively； （d） Physical photographs of the photoresponsive Ch_OH LC system obtained without polarizer， with left-hand circular polarizer and with right-hand circular polarizer under electric field modulation in PSS₄₅₀ state.

Fig. 8. （a～c） Reflective spectra of the initial state and PSS₄₅₀ state of the double-layer LC structure and （d） the corresponding physical photos obtained without polarizers， left-handed circular polarizers， and right-handed circular polarizers during electric field control.