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Proceedings Paper

Optical intensity modulation using ferro-electric liquid crystal
Author(s): K. G. Balakrishnan; P. Ramakrishnan
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Paper Abstract

Ferroelectric liquid crystals have been the subject of investigation, ever since its discovery as a display element in dynamic display systems. Electro-optic studies show that most of the materials exhibits a permanent switched state above a threshold field. It rarely exhibited a linear proportiotnality of transmitted light with applied field. In this paper a new material has been investigated. Electro-optic switching characteristics in bulk samples of ferro-electric liquid crystal, 4'-(n-Octyl Benzoloxy) -4- (2-Octyloxy) Biphenyl [OBOB]gwere studied for various pulse widths of the applied field. It shows three distinct regions of response. For large pulse widths, above a threshold field, a permanent switched state with maximum intensity of light transmission was achieved. This corresponds to the expected ferroelectric liquid crystal switching behaviour. For medium pulse widths the intensity of the transmitted light varies directly as the applied field over a particular range of pulse widths. This region of response, where the intensity of light is modulated with the applied field is the one most suited for device application.

Paper Details

Date Published: 1 December 1990
PDF: 4 pages
Proc. SPIE 1337, Nonlinear Optical Properties of Organic Materials III, (1 December 1990); doi: 10.1117/12.22965
Show Author Affiliations
K. G. Balakrishnan, Cochin Univ. of Science and Technology (India)
P. Ramakrishnan, Cochin Univ. of Science and Technology (India)

Published in SPIE Proceedings Vol. 1337:
Nonlinear Optical Properties of Organic Materials III
Garo Khanarian, Editor(s)

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