Inam, M. and Singh, G. and Srivastava, V. and Prakash, J. and Joshi, T. and Biradar, A. M. and Mehta, D. S. (2011) Two-dimensional cell parameters measurement of nematic liquid crystal using optical interferometry and Fourier transform fringe analysis technique. Optics Communications , 284 (23). pp. 5448-5452. ISSN 0030-4018

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Abstract

We report a method for the measurement of nematic liquid crystal (NLC) cell parameters i.e., switching voltage, birefringence, retardation, dielectric anisotropy, average tilt angle and change in refractive index with applied DC voltage to LC material. The proposed method is based on optical interferometry and Fourier transform fringe analysis technique, in which we obtain 2-dimensional (2D) phase map of the interferograms as a function of applied voltage. Mach–Zehnder interferometer (MZI) was used for the study of cell parameters and interferograms were recorded at different applied DC voltages to NLC cell using CCD camera. From the phase map, 2D-refractive index distribution of the LC cell with applied voltage was reconstructed. Analytical equations are derived based on optical interferometry and then solved to obtain cell parameters. The present method is fast and can give 2D-cell parameters from only two quick interferograms.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	Nematic liquid crystal; Mach-Zehnder interferometer; Fourier transform fringe analysis; Cell parameters;
Subjects:	Optics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	05 Oct 2012 12:20
Last Modified:	05 Oct 2012 12:20
URI:	http://npl.csircentral.net/id/eprint/668

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