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The role of surface charge field in two-beam coupling in liquid crystal cells with photoconducting polymer layers

The role of surface charge field in two-beam coupling in liquid crystal cells with photoconducting polymer layers
The role of surface charge field in two-beam coupling in liquid crystal cells with photoconducting polymer layers
In liquid crystal cells with photoconductive poly(N-vinlyl carbazole) polymer layers, an external dc field can be completely screened by surface charge layers that develop at the liquid crystal–polymer interface. Under spatially modulated illumination, surface charge layers can be discharged in bright areas and lead to reorientation and spatially modulated Freedericksz transition. As a result, an asymmetric energy exchange in the photorefractive two-beam coupling process can take place. We propose a model to explain the origin of reorientation and phase shift in the two-beam coupling process, based on the profile and tilt of the refractive index grating. We also show that cells with just one photoconducting layer are more efficient than a typical design with two layers.
0021-8979
2616-2623
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Dyadyusha, A.
2d1d75d4-60f0-4437-8771-0d0b9a3c7931
Slussarenko, S.
798195e5-7e4a-4c97-91fd-3c8b52f6b5c1
Khoo, I.C.
30fd5f3e-c921-4d75-b9cf-fd2baf34d6d4
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Dyadyusha, A.
2d1d75d4-60f0-4437-8771-0d0b9a3c7931
Slussarenko, S.
798195e5-7e4a-4c97-91fd-3c8b52f6b5c1
Khoo, I.C.
30fd5f3e-c921-4d75-b9cf-fd2baf34d6d4

Kaczmarek, M., Dyadyusha, A., Slussarenko, S. and Khoo, I.C. (2004) The role of surface charge field in two-beam coupling in liquid crystal cells with photoconducting polymer layers. Journal of Applied Physics, 96 (5), 2616-2623. (doi:10.1063/1.1778818).

Record type: Article

Abstract

In liquid crystal cells with photoconductive poly(N-vinlyl carbazole) polymer layers, an external dc field can be completely screened by surface charge layers that develop at the liquid crystal–polymer interface. Under spatially modulated illumination, surface charge layers can be discharged in bright areas and lead to reorientation and spatially modulated Freedericksz transition. As a result, an asymmetric energy exchange in the photorefractive two-beam coupling process can take place. We propose a model to explain the origin of reorientation and phase shift in the two-beam coupling process, based on the profile and tilt of the refractive index grating. We also show that cells with just one photoconducting layer are more efficient than a typical design with two layers.

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Published date: 1 September 2004

Identifiers

Local EPrints ID: 15081
URI: https://eprints.soton.ac.uk/id/eprint/15081
ISSN: 0021-8979
PURE UUID: 4cefe988-28ba-407d-bee8-f076764085e3

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Date deposited: 16 Mar 2005
Last modified: 14 Aug 2019 17:52

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Contributors

Author: M. Kaczmarek
Author: A. Dyadyusha
Author: S. Slussarenko
Author: I.C. Khoo

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