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Electric field control of diffraction and noise in dye-doped liquid crystals

Electric field control of diffraction and noise in dye-doped liquid crystals
Electric field control of diffraction and noise in dye-doped liquid crystals
We present results on permanent gratings in highly dye-doped liquid crystal cells without polymer coatings of the cells' surfaces. The surface-mediated gratings remain in cells for months without degradation of their quality. The peak diffraction efficiency can be controlled, enhanced or decreased, by applying low voltage AC field. At low frequencies, below 1 Hz, the diffracted signal can modulated by the AC field, but the time development of the signal shows a complex response. The enhancement of diffraction can be, however, observed at all frequencies we tested (0.1 Hz – 300 kHz). The permanent gratings cannot be removed by heating above the liquid crystal phase transition temperature as on cooling the diffraction efficiency is restored.
reorientation, permanent grating, dye doped liquid crystals, surface anchoring
1058-7268
331-338
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Cudney, R.S.
44f6a973-4931-4657-a759-a5b4414f1451
Tatarkova, S.A.
bb56f422-4963-4351-8186-62da498eeeb7
Kaczmarek, M.
408ec59b-8dba-41c1-89d0-af846d1bf327
Cudney, R.S.
44f6a973-4931-4657-a759-a5b4414f1451
Tatarkova, S.A.
bb56f422-4963-4351-8186-62da498eeeb7

Kaczmarek, M., Cudney, R.S. and Tatarkova, S.A. (2001) Electric field control of diffraction and noise in dye-doped liquid crystals. Nonlinear Optics, 27, 331-338.

Record type: Article

Abstract

We present results on permanent gratings in highly dye-doped liquid crystal cells without polymer coatings of the cells' surfaces. The surface-mediated gratings remain in cells for months without degradation of their quality. The peak diffraction efficiency can be controlled, enhanced or decreased, by applying low voltage AC field. At low frequencies, below 1 Hz, the diffracted signal can modulated by the AC field, but the time development of the signal shows a complex response. The enhancement of diffraction can be, however, observed at all frequencies we tested (0.1 Hz – 300 kHz). The permanent gratings cannot be removed by heating above the liquid crystal phase transition temperature as on cooling the diffraction efficiency is restored.

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More information

Published date: 2001
Keywords: reorientation, permanent grating, dye doped liquid crystals, surface anchoring

Identifiers

Local EPrints ID: 15134
URI: https://eprints.soton.ac.uk/id/eprint/15134
ISSN: 1058-7268
PURE UUID: 99447b65-d5cd-406c-9383-c0fcb03d69e5

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Date deposited: 17 Mar 2005
Last modified: 17 Jul 2017 16:51

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