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Control of liquid crystal order by surface electric fields and microstructuring

Control of liquid crystal order by surface electric fields and microstructuring
Control of liquid crystal order by surface electric fields and microstructuring
Microstructured cells with optical feedback were filled with nematic liquid crystals. The cells were assembled by combining planar ITO substrates and gold-coated hemispherical micro-mirrors. Optical reflection images showed a remarkable change of symmetry in the back-reflected, polarised light when an external voltage was applied. Theoretical modelling of the alignment of the liquid crystals, confined in microstructured cells, was carried out in parallel with the experimental work. The motion of defects under the effect of the applied cross-sections of simulated molecular director inside the microcavity for 0 V (top) and 10 V (bottom) electric field was predicted and this effect can be responsible for the change of symmetry of the back-reflected light. Surface charging effects are also studied, the results indicate that the reorientation grating originates from the build-up and discharge of surface charge screening layers, spatially modulated due to the photoconductivity of doped poly(N-vinyl carbazole) (PVK). The formation and subsequent discharge of surface charge screening layers can, in fact, be the main force influencing the reorientation of liquid crystal molecules.
564-565
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Dyadyusha, A.
2d1d75d4-60f0-4437-8771-0d0b9a3c7931
D'Alessandro, G.
bd3a41cb-d72d-4433-86f4-712358e0e4c1
Gilchrist, G.
c212edfe-27d5-44c0-913d-efe3b85d3495
Prakash, V.J.
f00d9b2d-76aa-4fa5-aa86-d6ec72a6708b
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Dyadyusha, A.
2d1d75d4-60f0-4437-8771-0d0b9a3c7931
D'Alessandro, G.
bd3a41cb-d72d-4433-86f4-712358e0e4c1
Gilchrist, G.
c212edfe-27d5-44c0-913d-efe3b85d3495
Prakash, V.J.
f00d9b2d-76aa-4fa5-aa86-d6ec72a6708b
Baumberg, J.J.
78e1ea7e-8c70-404c-bf84-59aafe75cd07

Kaczmarek, M., Dyadyusha, A., D'Alessandro, G., Gilchrist, G., Prakash, V.J. and Baumberg, J.J. (2005) Control of liquid crystal order by surface electric fields and microstructuring. Lasers and Electro-Optics Society, 2005, (LEOS 2005), The 18th Annual Meeting of the IEEE, 564-565. (doi:10.1109/LEOS.2005.1548130).

Record type: Article

Abstract

Microstructured cells with optical feedback were filled with nematic liquid crystals. The cells were assembled by combining planar ITO substrates and gold-coated hemispherical micro-mirrors. Optical reflection images showed a remarkable change of symmetry in the back-reflected, polarised light when an external voltage was applied. Theoretical modelling of the alignment of the liquid crystals, confined in microstructured cells, was carried out in parallel with the experimental work. The motion of defects under the effect of the applied cross-sections of simulated molecular director inside the microcavity for 0 V (top) and 10 V (bottom) electric field was predicted and this effect can be responsible for the change of symmetry of the back-reflected light. Surface charging effects are also studied, the results indicate that the reorientation grating originates from the build-up and discharge of surface charge screening layers, spatially modulated due to the photoconductivity of doped poly(N-vinyl carbazole) (PVK). The formation and subsequent discharge of surface charge screening layers can, in fact, be the main force influencing the reorientation of liquid crystal molecules.

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Published date: 2005

Identifiers

Local EPrints ID: 57323
URI: https://eprints.soton.ac.uk/id/eprint/57323
PURE UUID: 586752ac-c313-4fa6-8a88-a4883af18182

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Date deposited: 15 Aug 2008
Last modified: 13 Mar 2019 20:34

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Contributors

Author: M. Kaczmarek
Author: A. Dyadyusha
Author: G. D'Alessandro
Author: G. Gilchrist
Author: V.J. Prakash
Author: J.J. Baumberg

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