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Surface charge layers and beam coupling in photosensitive polymer-liquid crystal structures

Surface charge layers and beam coupling in photosensitive polymer-liquid crystal structures
Surface charge layers and beam coupling in photosensitive polymer-liquid crystal structures
We present results on DC field and light-induced photorefractive-like gratings in liquid crystal cells made with photosensitive polymer layers. Surface charge layers that develop on a liquid crystal-polymer interface are responsible for screening the liquid crystal bulk from an external DC field. These layers can be selectively discharged via polymer photoconductivity and lead to liquid crystal reorientation grating. Efficient two-beam coupling gain can arise from the reorientation grating for relatively high DC field (above 30 V). For lower voltages, strong diffraction can be observed that reduces the gain. Two-beam coupling gain and diffraction can also be controlled by experimental geometry and liquid crystal alignment. The simulated profile of electric field shows that its penetration depth depends on grating spacing.
19-27
SPIE
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Dyadyusha, Andriy
daa939a8-2860-4a31-ab12-7950bf59aeef
Khoo, Iam-Choon
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Dyadyusha, Andriy
daa939a8-2860-4a31-ab12-7950bf59aeef
Khoo, Iam-Choon

Kaczmarek, Malgosia and Dyadyusha, Andriy (2004) Surface charge layers and beam coupling in photosensitive polymer-liquid crystal structures. In, Khoo, Iam-Choon (ed.) Liquid Crystals VIII. (Proceedings of SPIE, 5518) Optical Science and Technology, the SPIE 49th Annual Meeting (02/08/04 - 06/08/04) Bellingham. SPIE, pp. 19-27. (doi:10.1117/12.563334).

Record type: Book Section

Abstract

We present results on DC field and light-induced photorefractive-like gratings in liquid crystal cells made with photosensitive polymer layers. Surface charge layers that develop on a liquid crystal-polymer interface are responsible for screening the liquid crystal bulk from an external DC field. These layers can be selectively discharged via polymer photoconductivity and lead to liquid crystal reorientation grating. Efficient two-beam coupling gain can arise from the reorientation grating for relatively high DC field (above 30 V). For lower voltages, strong diffraction can be observed that reduces the gain. Two-beam coupling gain and diffraction can also be controlled by experimental geometry and liquid crystal alignment. The simulated profile of electric field shows that its penetration depth depends on grating spacing.

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More information

Published date: 15 October 2004
Venue - Dates: Optical Science and Technology, the SPIE 49th Annual Meeting, , Denver, Colorado, United States, 2004-08-02 - 2004-08-06

Identifiers

Local EPrints ID: 15125
URI: http://eprints.soton.ac.uk/id/eprint/15125
PURE UUID: 649fd7ad-3fd1-4608-8c1d-67dfb3f46849

Catalogue record

Date deposited: 21 Mar 2005
Last modified: 09 Nov 2021 06:33

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Contributors

Author: Andriy Dyadyusha
Editor: Iam-Choon Khoo

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