title: Electrically switchable optical vortex generated by a computer-generated hologram recorded in polymer-dispersed liquid crystals.
abstract: A computer-generated hologram designed to generate an optical vortex was recorded in a cell filled with polymer-dispersed liquid crystal material under a collimated Ar+ laser beam operating at 514.5 nm. Owing to the photopolymerization-induced phase separation between the polymer and the liquid crystal, an index modulation was formed between the polymer-rich and liquid crystal-rich regions. A good optical vortex beam with high fidelity was reconstructed using a collimated He-Ne laser beam. The diffraction efficiency is estimated to be about 13%-17%. With a suitable voltage applied, the reconstructed optical vortex beam can be switched owing to the index change between the polymer and the liquid crystal.
authors: Y J
authors: YJ
authors: Liu
authors: X W
authors: XW
authors: Sun
authors: Q
authors: Q
authors: Wang
authors: D
authors: D
authors: Luo