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Proceedings Paper

Measurement, control, and use of non-locality in some liquid crystal based devices
Author(s): M. Warenghem; J. F. Henninot; J. F. Blach
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Paper Abstract

Mixing non-local process in a material with non-local response can yield to interesting phenomena. This is the case of spatial optical solitons excited in liquid crystals. It has been shown that spatial optical quasi-soliton can be generated either via a heat transfer process or a molecular reorientation. In both cases, light keeps propagating in the waveguide it created. Different parameters can be adjusted to optimize this waveguide and as a result the propagation of the quasi-soliton. Prior to control those parameters, it is interesting to measure the global non locality, i.e. the extension of the beam together with the induced index profile. Herein, it is reported first the main results on quasi soliton in liquid crystals, some technique to measure the induced index distribution. Then, a new method, based on Raman spectroscopy, is proposed to measure simultaneously the beam intensity distribution and the induced molecular reorientation in the case of a soliton generated via reorientation nonlinearity of a nematic liquid crystal. Finally, it is shown how the non-locality can be controlled and used. The case of a curved waveguide obtained this way is reminded.

Paper Details

Date Published: 7 October 2005
PDF: 10 pages
Proc. SPIE 5947, Liquid Crystals: Optics and Applications, 59470N (7 October 2005); doi: 10.1117/12.620893
Show Author Affiliations
M. Warenghem, Lab. de Physico Chimie des Interfaces et Applications, CNRS, Univ. d'Artois (France)
J. F. Henninot, Lab. de Physico Chimie des Interfaces et Applications, CNRS, Univ. d'Artois (France)
J. F. Blach, Lab. de Physico Chimie des Interfaces et Applications, CNRS, Univ. d'Artois (France)


Published in SPIE Proceedings Vol. 5947:
Liquid Crystals: Optics and Applications
Tomasz R. Wolinski; Marc Warenghem; Shin-Tson Wu, Editor(s)

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