Influence of gamma radiation on the electrooptic behavior of planar nematic liquid crystal cells

Francis Berghmans; Krzysztof Zdrodowski; Tomasz Nasilowski; Marc Decréton; Irina Veretennicoff; Hugo Thienpont

doi:10.1109/68.559395

Influence of gamma radiation on the electrooptic behavior of planar nematic liquid crystal cells

Francis Berghmans
, Krzysztof Zdrodowski
, Tomasz Nasilowski
, Marc Decréton
, Irina Veretennicoff
, Hugo Thienpont

Research output › peer-review

Abstract

We irradiated planar nematic liquid crystal cells with gamma-rays, to study the radiation hardness of their electrooptic characteristics. From the evolution of the electrooptic retardance curve with irradiation dose, we estimated the change of the characteristic liquid crystal material parameters with dose, using a nonlinear least square fitting algorithm. The overall gamma radiation hardness of the device is satisfactory up to doses of 456 kGy(H₂O). Two effects, however, influence the operation of liquid crystal cells as voltage tuneable retarders. Radiation affects first the cohesion of the liquid crystal molecules at the boundaries and second, the conductivity of the liquid crystal cells.

Original language	English
Pages (from-to)	481-483
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	9
Issue number	4
DOIs	https://doi.org/10.1109/68.559395
State	Published - Apr 1997

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

Access to Document

10.1109/68.559395

Cite this

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title = "Influence of gamma radiation on the electrooptic behavior of planar nematic liquid crystal cells",

abstract = "We irradiated planar nematic liquid crystal cells with gamma-rays, to study the radiation hardness of their electrooptic characteristics. From the evolution of the electrooptic retardance curve with irradiation dose, we estimated the change of the characteristic liquid crystal material parameters with dose, using a nonlinear least square fitting algorithm. The overall gamma radiation hardness of the device is satisfactory up to doses of 456 kGy(H2O). Two effects, however, influence the operation of liquid crystal cells as voltage tuneable retarders. Radiation affects first the cohesion of the liquid crystal molecules at the boundaries and second, the conductivity of the liquid crystal cells.",

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T1 - Influence of gamma radiation on the electrooptic behavior of planar nematic liquid crystal cells

AU - Berghmans, Francis

AU - Zdrodowski, Krzysztof

AU - Nasilowski, Tomasz

AU - Decréton, Marc

AU - Veretennicoff, Irina

AU - Thienpont, Hugo

PY - 1997/4

Y1 - 1997/4

N2 - We irradiated planar nematic liquid crystal cells with gamma-rays, to study the radiation hardness of their electrooptic characteristics. From the evolution of the electrooptic retardance curve with irradiation dose, we estimated the change of the characteristic liquid crystal material parameters with dose, using a nonlinear least square fitting algorithm. The overall gamma radiation hardness of the device is satisfactory up to doses of 456 kGy(H2O). Two effects, however, influence the operation of liquid crystal cells as voltage tuneable retarders. Radiation affects first the cohesion of the liquid crystal molecules at the boundaries and second, the conductivity of the liquid crystal cells.

AB - We irradiated planar nematic liquid crystal cells with gamma-rays, to study the radiation hardness of their electrooptic characteristics. From the evolution of the electrooptic retardance curve with irradiation dose, we estimated the change of the characteristic liquid crystal material parameters with dose, using a nonlinear least square fitting algorithm. The overall gamma radiation hardness of the device is satisfactory up to doses of 456 kGy(H2O). Two effects, however, influence the operation of liquid crystal cells as voltage tuneable retarders. Radiation affects first the cohesion of the liquid crystal molecules at the boundaries and second, the conductivity of the liquid crystal cells.

KW - Birefringence

KW - Conductivity

KW - Electrooptic materials/devices

KW - Gamma-ray effects

KW - Liquid crystal materials/devices

KW - Parameter estimation

KW - Permittivity

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