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We study the electro-optic properties of subwavelength-pitch deformed-helixferroelectric liquid crystals (DHFLC) illuminated with unpolarized light. Inthe experimental setup based on the Mach-Zehnder interferometer, it wasobserved that the reference and the sample beams being both unpolarized producethe interference pattern which is insensitive to rotation of in-plane opticalaxes of the DHFLC cell. We find that the field-induced shift of theinterference fringes can be described in terms of the electrically dependentPancharatnam relative phase determined by the averaged phase shift, whereas thevisibility of the fringes is solely dictated by the phase retardation.

Modulation of unpolarized light in planar aligned subwavelength-pitch deformed-helix ferroelectric liquid crystals