Fig. 1. Schematic illustration of LC director configurations in cholesteric (a) helicoidal, (b) heliconical, and (c) unwound states under increased applied electric fields.

Fig. 2. Electrical tuning performance of the (a) oblique angle θ and (b) pitch length P in helicoidal, heliconical, and unwound states with various η value.

Fig. 3. Electrical tuning performance of the (a) transformation threshold, (b) oblique angle, and (c) pitch length in the heliconical superstructure on the effects of chirality changes.

Fig. 4. Simulated selective reflection spectra from the left-handed heliconical superstructure with various electric fields in the cases of R-CP and L-CP normal incidence.

Fig. 5. Calculated reflection spectra from the heliconical superstructure with the changes of electric field and initial chirality.