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Electrically switchable optical vortex generated by a computer-generated hologram recorded in polymer-dispersed liquid crystals.

Authors
  • Liu, Y J
  • Sun, X W
  • Wang, Q
  • Luo, D
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Dec 10, 2007
Volume
15
Issue
25
Pages
16645–16650
Identifiers
PMID: 19550950
Source
Medline
License
Unknown

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.

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