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A liquid crystal optical device made of an optically anisotropicheterostructure is considered. The device consists of a cholesteric liquidcrystal (CLC) layer sandwiched by two phase-shifting anisotropic layers of anematic liquid crystal (NLC). In this structure each of the NLC layers is aquarterwave plate. The problem is solved both by Ambartsumian method of layeraddition and Muller matrix method. The peculiarities of reflection spectra,eigen polarizations, rotation of polarization plane and polarizationellipticity are studied. It is shown that this device can work as a lightmodulator or a system for obtaining linearly polarized light with electricallytunable rotation of the polarization plane (which is especially important foroptical communication), as well as a device for obtaining the linearlypolarized light from a non-polarized one.

Composite Cell from Nematic and Cholesteric Liquid Crystals as an Rotator of Electrically Tunable Polarization Plane