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Proceedings Paper

Instability of light-driven convective motions
Author(s): R. S. Akopyan; R. B. Alaverdyan; Yu. S. Chilingaryan; H. Ye Seferyan
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Paper 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.

Paper Details

Date Published: 29 May 2002
PDF: 12 pages
Proc. SPIE 4748, ICONO 2001: Fundamental Aspects of Laser-Matter Interaction and Physics of Nanostructures, (29 May 2002); doi: 10.1117/12.468935
Show Author Affiliations
R. S. Akopyan, Yerevan State Univ. (Armenia)
R. B. Alaverdyan, Yerevan State Univ. (Armenia)
Yu. S. Chilingaryan, Yerevan State Univ. (Armenia)
H. Ye Seferyan, Yerevan State Univ. (Armenia)


Published in SPIE Proceedings Vol. 4748:
ICONO 2001: Fundamental Aspects of Laser-Matter Interaction and Physics of Nanostructures

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