Fig. 1.

(A) Schematic of an HN-CPC as a chiroptical rotator. Δφ: optical rotation angle, L: thickness, p: helical pitch, Λ: grating period, E^(i)/(t): incident (input) and transmitted (output) linear polarizations, E_+/−: right circular (σ₊) and left circular (σ₋) polarizations, k: wavevector of light, ↻: clockwise, ↺: counterclockwise. (B) Orientational relationships between optical electric field and LC director under three different conditions: left circular polarization at the mid-gap (Left), right circular polarization at short-wavelength edge (SWE) (Middle), right circular polarization at long-wavelength edge (LWE) (Right).