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Proceedings Paper

Determination of the Jones matrix of an LC cell and derivation of the physical parameters of the LC molecules
Author(s): Andreas Hermerschmidt; Stephanie Quiram; Frank Kallmeyer; Hans Joachim Eichler
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Paper Abstract

The wavelength-dependent Jones matrix representation of a twisted-nematic liquid crystal (TN-LC) cell contains four independent parameters. The absolute values of these parameters and two mutual sign relationships can be determined from comparatively simple transmission measurements of the TN-LC cells sandwiched between two rotatable polarizers. The physical parameters of the cell (twist angle α, director orientation ψ, birefringence β) can be retrieved if the Jones matrix is known for more than one wavelength. We have measured the Jones matrices of the TN-LC cells of a translucent Sony LCX-016 microdisplay for six wavelengths ranging from 488nm to 1064nm and determined the physical parameters of the cell. We have also measured the Jones matrices for one wavelength for a number of applied voltages. These experimental results show that it is not sufficiently exact to calculate the Jones matrix from the known physical parameters of the cell assuming a voltage-dependent birefringence only. We attribute the deviations from the theoretical model to edge effects which are not taken into account. The direct experimental determination of the Jones matrix components is therefore preferable and permits a more accurate simulation of the TN-LC microdisplay in experimental configurations involving other polarization-dependent optical components.

Paper Details

Date Published: 9 May 2007
PDF: 8 pages
Proc. SPIE 6587, Liquid Crystals and Applications in Optics, 65871B (9 May 2007); doi: 10.1117/12.722895
Show Author Affiliations
Andreas Hermerschmidt, Holoeye Photonics AG (Germany)
Stephanie Quiram, Technische Univ. Berlin (Germany)
Frank Kallmeyer, Technische Univ. Berlin (Germany)
Hans Joachim Eichler, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 6587:
Liquid Crystals and Applications in Optics
Milada Glogarova; Peter Palffy-Muhoray; Martin Copic, Editor(s)

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