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

Andy Ying Guey Fuh, Chia Rong Lee, Ya Hui Ho

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)4585-4589
Number of pages5
JournalApplied optics
Volume41
Issue number22
DOIs
Publication statusPublished - 2002 Aug 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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