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Switchable Two-Dimensional Gratings Based On Field-Induced Layer Undulations In Cholesteric Liquid Crystals, B. I. Senyuk, I. I. Smalyukh, Oleg Lavrentovich
Switchable Two-Dimensional Gratings Based On Field-Induced Layer Undulations In Cholesteric Liquid Crystals, B. I. Senyuk, I. I. Smalyukh, Oleg Lavrentovich
Oleg Lavrentovich
We propose switchable two-dimensional (2D) diffractive gratings with periodic refractive-index modulation arising from layer undulations in cholesteric liquid crystals. The cholesteric cell can be switched between two states: (1) f lat layers of a planar cholesteric texture and (2) a square lattice of periodic director modulation associated with layer undulations that produces 2D diffraction patterns. The intensities of the diffraction maxima can be tuned by changing the applied field. The diffractive properties can be optimized for different wavelengths by appropriately choosing cholesteric pitch, cell thickness, and surface treatment.