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Applied voltage response of a cholesteric liquid crystal cell observed by simultaneous measurement of phase and reflection changes based on optical interferometry

The behavior of a cholesteric liquid crystal (CLC) cell under the voltage application condition was quantitatively investigated. To observe the realignment of the CLC including helical pitch and tilt angle changes, the phase delay change and amplitude reduction of transmitted light were measured simultaneously and individually using a Mach–Zehnder interferometer. Compared to a numerical simulation based on a 4 × 4 method, changes in the helical pitch and tilt angle of the CLC cell were quantitatively determined.