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Electrically tunable, optically induced dynamic and permanent gratings in dye-doped liquid crystals

Electrically tunable, optically induced dynamic and permanent gratings in dye-doped liquid crystals
Electrically tunable, optically induced dynamic and permanent gratings in dye-doped liquid crystals
We report on further experimental studies of the ac field response of transient and permanent gratings written with visible light in both planar and homeotropic, dye-doped liquid crystal cells. It is found that the diffraction efficiency of these gratings can be controlled by the applied ac field. High ac frequencies can switch off diffraction completely in both permanent and transient gratings. The response time to the applied electric field is shown to be in the range of milliseconds. Permanent gratings persist for months and, when heated above the liquid crystal phase transition temperature, they can be only partially erased. Furthermore, on cooling the diffraction efficiency can be restored, indicating a strong anchoring at the boundaries of the cell
liquid crystals, transient and permanent gratings, ac field enhancement, switching, refractive index change
0018-9197
451-457
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Shih, Min-Yi
4b1a858d-afe4-4ce0-a590-9dd393cdf25a
Cudney, Roger S.
a5a3ad3e-0d2f-436a-91f2-07178d56b248
Khoo, Iam-Choon
dc6a689b-99d3-4a2b-a947-0890194a4b93
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Shih, Min-Yi
4b1a858d-afe4-4ce0-a590-9dd393cdf25a
Cudney, Roger S.
a5a3ad3e-0d2f-436a-91f2-07178d56b248
Khoo, Iam-Choon
dc6a689b-99d3-4a2b-a947-0890194a4b93

Kaczmarek, Malgosia, Shih, Min-Yi, Cudney, Roger S. and Khoo, Iam-Choon (2002) Electrically tunable, optically induced dynamic and permanent gratings in dye-doped liquid crystals. IEEE Journal of Quantum Electronics, 38 (5), 451-457. (doi:10.1109/3.998616).

Record type: Article

Abstract

We report on further experimental studies of the ac field response of transient and permanent gratings written with visible light in both planar and homeotropic, dye-doped liquid crystal cells. It is found that the diffraction efficiency of these gratings can be controlled by the applied ac field. High ac frequencies can switch off diffraction completely in both permanent and transient gratings. The response time to the applied electric field is shown to be in the range of milliseconds. Permanent gratings persist for months and, when heated above the liquid crystal phase transition temperature, they can be only partially erased. Furthermore, on cooling the diffraction efficiency can be restored, indicating a strong anchoring at the boundaries of the cell

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More information

Published date: 2002
Keywords: liquid crystals, transient and permanent gratings, ac field enhancement, switching, refractive index change

Identifiers

Local EPrints ID: 15132
URI: https://eprints.soton.ac.uk/id/eprint/15132
ISSN: 0018-9197
PURE UUID: 72014f6a-068e-4065-b0ec-0deaf4c63c4b

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Date deposited: 21 Mar 2005
Last modified: 17 Jul 2017 16:51

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