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

Funding

Manuscript received November 14, 1996; revised December 27, 1996. This work was supported by the Belgian National Fund for Scientific Research (NFWO) for the acquisition of the real-time polarization analyzer and by IUAP-13. F. Berghmans and M. Decréton are with the SCK*CEN, Belgian Nuclear Research Center, B-2400 Mol, Belgium. K. Zdrodowski, T. Nasilowski, I. Veretennicoff, and H. Thienpont are with the VUB, University of Brussels, B-1050 Brussels, Belgium. Publisher Item Identifier S 1041-1135(97)02409-9.

Funders	Funder number
Not added	IUAP-13
FRS-FNRS - Fond national de la recherche scientifique

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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AU - Veretennicoff, Irina

AU - Thienpont, Hugo

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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.

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