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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 22 — Aug. 1, 2002
  • pp: 4585–4589

Thermally and electrically switchable gratings based on polymer-ball-type polymer-dispersed liquid-crystal films

Andy Ying-Guey Fuh, Chia-Rong Lee, and Ya-Hui Ho  »View Author Affiliations


Applied Optics, Vol. 41, Issue 22, pp. 4585-4589 (2002)
http://dx.doi.org/10.1364/AO.41.004585


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Abstract

We focus on the fabrication and study of controllable holographic gratings based on azo-dye-doped and undoped polymer-ball-type polymer-dispersed liquid-crystal films. Experimental results indicate that the next step of photopolymerization of the sample with the illumination of Ar+ laser beams after UV curing causes a latent density grating to be recorded. This grating is formed by a selective secondary photopolymerization. Heating and applying a voltage change the structure of the liquid crystal and induce the appearance of the latent grating. Diffraction efficiencies versus temperature, voltage, and state of polarization are studied for both dye-doped and undoped cells and are found to be quite different. This discrepancy is attributable to the reorientation effect of liquid crystals through their interaction with the photo-induced adsorption of the doped dyes on the surface of polymer balls in the dye-doped cell.

© 2002 Optical Society of America

OCIS Codes
(090.2900) Holography : Optical storage materials
(160.3710) Materials : Liquid crystals
(160.5470) Materials : Polymers

History
Original Manuscript: January 10, 2002
Revised Manuscript: April 24, 2002
Published: August 1, 2002

Citation
Andy Ying-Guey Fuh, Chia-Rong Lee, and Ya-Hui Ho, "Thermally and electrically switchable gratings based on polymer-ball-type polymer-dispersed liquid-crystal films," Appl. Opt. 41, 4585-4589 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-22-4585


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