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Proceedings Paper

Multiple grating formation in photorefractive polymers with azo-dye chromophores
Author(s): Mark A. Smith; Nick R. King; Geoffrey R. Mitchell; Sean V. O'Leary
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Paper Abstract

Photorefractive polymers which incorporate azo-dyes as the nonlinear chromophore element, can be used not only for generating gratings by the photorefractive effect, but also by photoisomerization of the azo-dye. In the latter mechanism, repeated trans-cis isomerization causes the chromophore molecules to become aligned at right angles to the laser polarization direction, thereby making the material birefringent. These two phenomena are to a large degree independent, and can be studied separately, by appropriate choice of polarization direction of the interacting beams. Furthermore, the diffraction efficiency of the photorefractive gratings is a very sensitive function of the poling field strength, while that of the photoisomerization gratings is less so. In this work, we investigate the components diffracted from each of these gratings formed in a hybrid photorefractive polymer material PVK:TNF:DEACST:disperse red 1. We then explore the possibility of performing some simple optical processing applications, exploiting the flexibility provided by this multiple grating process. A scheme for producing a novelty filter, which displays only the moving parts of a scene is considered. The limitations of these films for such processing applications are discussed.

Paper Details

Date Published: 15 October 1996
PDF: 8 pages
Proc. SPIE 2850, Organic Photorefractive Materials and Xerographic Photoreceptors, (15 October 1996); doi: 10.1117/12.254242
Show Author Affiliations
Mark A. Smith, Univ. of Reading (United Kingdom)
Nick R. King, Univ. of Reading (United Kingdom)
Geoffrey R. Mitchell, Univ. of Reading (United Kingdom)
Sean V. O'Leary, Univ. of Reading (United Kingdom)

Published in SPIE Proceedings Vol. 2850:
Organic Photorefractive Materials and Xerographic Photoreceptors
Stephen Ducharme; James W. Stasiak, Editor(s)

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