We demonstrate a polarization-invariant liquid-crystal (LC) grating in an oppositely twisted and mutually orthogonal configuration. The polarization-invariant LC grating with high diffraction efficiency is fabricated using a single-masking process with two-step exposure of a linearly polarized ultraviolet light. It is found that the zeroth- and the first-order diffracted beams are linearly polarized and perpendicular to each other irrespective of the incident polarization for the phase retardation of m pi (m = integer).
© 2005 Optical Society of America
Chang-Jae Yu, Dong-Woo Kim, Jinyool Kim, and Sin-Doo Lee, "Polarization-invariant grating based on a photoaligned liquid crystal in an oppositely twisted binary configuration," Opt. Lett. 30, 1995-1997 (2005)