Chiral liquid crystals, such as cholesteric liquid crystal or ferroelectric liquid crystal are expected to be a candidate of a tunable photonic crystal. These liquid crystals have a property of selective reflection. Ferroelectric liquid crystals have a full pitch band that does not exist in cholesteric liquid crystals. The bandwidth of the full pitch band becomes wider at highly oblique incidence. In this study, we calculate deformations in a helical structure of a ferroelectric liquid crystal

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... y applying voltage using continuum theory. Furthermore, we also calculate transmission spectra of the full pitch band of the ferroelectric liquid crystal with the helix deformation at oblique incidence.