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Applied Optics

Applied Optics


  • Vol. 41, Iss. 7 — Mar. 1, 2002
  • pp: 1246–1250

Nematic liquid-crystal polarization gratings by modification of surface alignment

Bing Wen, Rolfe G. Petschek, and Charles Rosenblatt  »View Author Affiliations

Applied Optics, Vol. 41, Issue 7, pp. 1246-1250 (2002)

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The stylus of an atomic force microscope is used to scribe preferred directions for liquid-crystal alignment on a polyimide-coated substrate. The opposing substrate that comprises the liquid-crystal cell is rubbed unidirectionally, resulting in a twisted nematic structure associated with each micrometer-sized pixel. The polarization of light entering from the uniformly rubbed substrate rotates with the nematic director by a different amount in each pixel, and each of the two emerging polarization eigenmodes interferes separately. Two examples are discussed: a square grating that allows only odd-order diffraction peaks and a grating that combines rotation with optical retardation to simulate a blazed grating for circularly polarized light. The gratings can be electrically switched if used with semitransparent electrodes.

© 2002 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(160.3710) Materials : Liquid crystals

Original Manuscript: July 10, 2001
Revised Manuscript: September 28, 2001
Published: March 1, 2002

Bing Wen, Rolfe G. Petschek, and Charles Rosenblatt, "Nematic liquid-crystal polarization gratings by modification of surface alignment," Appl. Opt. 41, 1246-1250 (2002)

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