29 May 2002 Instability of light-driven convective motions
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Proceedings Volume 4748, ICONO 2001: Fundamental Aspects of Laser-Matter Interaction and Physics of Nanostructures; (2002); doi: 10.1117/12.468935
Event: XVII International Conference on Coherent and Nonlinear Optics (ICONO 2001), 2001, Minsk, Belarus
Abstract
In this paper we report both experimental and theoretical results on Rayleigh-Benard and Marangoni convection instability experiments in isotropic liquids and nematic liquid crystals. This instability is driven and controlled by medium absorbing a light radiation with a spatially periodical transverse structure. This instability has rather thermal than hydrodynamic nature because Prandtl number is much larger than one for our media. We study the competition of two mechanisms for reorientation of the liquid crystal molecules. Gravitational and thermocapillary hydrodynamic waves induced by traveling spatially periodical distribution of light intensity are observed and investigated. The stability of these waves is studied as well. We also study the influence of convective motions on the isotropic liquid- liquid crystal phase transition.
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R. S. Akopyan, R. B. Alaverdyan, Yu. S. Chilingaryan, H. Ye Seferyan, "Instability of light-driven convective motions", Proc. SPIE 4748, ICONO 2001: Fundamental Aspects of Laser-Matter Interaction and Physics of Nanostructures, (29 May 2002); doi: 10.1117/12.468935; http://dx.doi.org/10.1117/12.468935
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KEYWORDS
Liquids

Convection

Liquid crystals

Fringe analysis

Absorption

Wave propagation

Interferometers

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