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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 3499–3508

Photoinduced helical inversion in cholesteric liquid crystal cells with homeotropic anchoring

Igor Gvozdovskyy, Oleg Yaroshchuk, Marina Serbina, and Rumiko Yamaguchi  »View Author Affiliations


Optics Express, Vol. 20, Issue 4, pp. 3499-3508 (2012)
http://dx.doi.org/10.1364/OE.20.003499


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Abstract

Structural changes caused by the optically induced helical inversion in the cholesteric liquid crystal cells with homeotropic anchoring are studied. In a one-step exposure, a sequence of structural transformations “lying left-handed helix – unwound homeotropic state – lying right-handed helix” is realized. In this process, smooth expansion of a left-handed helix, transition to an unwound state, emergence and smooth compression of a right-handed helix was observed. The unwound state was maintained over a rather wide range of exposures. Well-oriented and highly periodic fingerprint textures capable of the above mentioned structural changes were obtained by rubbing the aligning substrates. This allowed for obtaining photo-tunable diffraction gratings and using them to demonstrate new beam steering principle. Also, pitch reversal suggested new options for optical recording, in particular contrast reversal and edge enhancement.

© 2012 OSA

OCIS Codes
(210.4810) Optical data storage : Optical storage-recording materials
(230.1950) Optical devices : Diffraction gratings
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

History
Original Manuscript: November 23, 2011
Revised Manuscript: December 26, 2011
Manuscript Accepted: December 29, 2011
Published: January 30, 2012

Citation
Igor Gvozdovskyy, Oleg Yaroshchuk, Marina Serbina, and Rumiko Yamaguchi, "Photoinduced helical inversion in cholesteric liquid crystal cells with homeotropic anchoring," Opt. Express 20, 3499-3508 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-4-3499


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