Large Angle Forward Diffraction by Chiral Liquid Crystal Gratings with Inclined Helical Axis

摘要: A layer of chiral liquid crystal (CLC) with a photonic bandgap in the visible range has excellent reflective properties. Recently, two director configurations have been proposed literature for CLC between substrates periodic photo-alignment: one parallel to and bulk tilted plane. The transmission experiments under large angles incidence (AOI) presented this work prove that, bulk, does not remain substrates. Because inclined helical axis, full reflection band can be observed at smaller AOI than planar CLC. For sufficiently AOI, diffracted light is prohibited by total internal efficient diffraction occurs forward direction.