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Proceedings Paper

Highly sensitive reorientation of a nematic liquid crystal by photoexcitation of space charge fields
Author(s): Rainer Macdonald; Peter Meindl; Stefan Busch; Hans Joachim Eichler
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Paper Abstract

A new molecular reorientation effect in nematic liquid crystals is investigated. The nonlinear optical effect occurs under the combined application of DC-electrical fields and low power illumination and has a very huge photosensitivity. Rather large nonlinear optical coefficients up to 6 cm2/W are obtained. Light intensities as low as 10-3 W/cm2 are sufficient for a strong photo-induced reorientation. Even a microscope lamp or a small torch provides enough illumination to induce remarkable changes in birefringence. The effect was first observed in liquid crystals of discotic molecules but is also present with calamatic, i.e. rod-like molecules.

Paper Details

Date Published: 14 October 1998
PDF: 9 pages
Proc. SPIE 3475, Liquid Crystals II, (14 October 1998); doi: 10.1117/12.326899
Show Author Affiliations
Rainer Macdonald, Technical Univ. of Berlin (Germany)
Peter Meindl, Technical Univ. of Berlin (Germany)
Stefan Busch, Technical Univ. of Berlin (Germany)
Hans Joachim Eichler, Technical Univ. of Berlin (Germany)

Published in SPIE Proceedings Vol. 3475:
Liquid Crystals II
Iam-Choon Khoo, Editor(s)

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