Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2894521
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An electrically tunable optical vortex was generated in an antiparallel liquid crystal cell, where one electrode was patterned by a photomask, which is achieved by transferring a computer-generated hologram onto a transparency with a resolution of about 25 mu m. When a voltage was applied on the cell, an index modulation was induced due to the realignment of liquid crystal molecules, and then an optical vortex beam was produced. The diffraction efficiency measured was about 27.5%. The device also showed a reasonably fast response time. (C) 2008 American Institute of Physics.
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