Stretching and squeezing of sessile dielectric drops by the optical radiation pressure

Hamza Chraïbi, Didier Lasseux, Eric Arquis, Régis Wunenburger, and Jean-Pierre Delville
Phys. Rev. E 77, 066706 – Published 17 June 2008

Abstract

We study numerically the deformation of sessile dielectric drops immersed in a second fluid when submitted to the optical radiation pressure of a continuous Gaussian laser wave. Both drop stretching and drop squeezing are investigated at steady state where capillary effects balance the optical radiation pressure. A boundary integral method is implemented to solve the axisymmetric Stokes flow in the two fluids. In the stretching case, we find that the drop shape goes from prolate to near-conical for increasing optical radiation pressure whatever the drop to beam radius ratio and the refractive index contrast between the two fluids. The semiangle of the cone at equilibrium decreases with the drop to beam radius ratio and is weakly influenced by the index contrast. Above a threshold value of the radiation pressure, these “optical cones” become unstable and a disruption is observed. Conversely, when optically squeezed, the drop shifts from an oblate to a concave shape leading to the formation of a stable “optical torus.” These findings extend the electrohydrodynamics approach of drop deformation to the much less investigated “optical domain” and reveal the openings offered by laser waves to actively manipulate droplets at the micrometer scale.

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  • Received 17 December 2007
  • Corrected 19 June 2008

DOI:https://doi.org/10.1103/PhysRevE.77.066706

©2008 American Physical Society

Corrections

19 June 2008

Erratum

Publisher's Note: Stretching and squeezing of sessile dielectric drops by the optical radiation pressure [Phys. Rev. E 77, 066706 (2008)]

Hamza Chraïbi, Didier Lasseux, Eric Arquis, Régis Wunenburger, and Jean-Pierre Delville
Phys. Rev. E 77, 069903 (2008)

Authors & Affiliations

Hamza Chraïbi, Didier Lasseux, and Eric Arquis

  • Transferts, Écoulements, Fluides, Énergétique (UMR CNRS 8508), Université Bordeaux I, Esplanade des Arts et Métiers, 33405 Talence Cedex, France

Régis Wunenburger and Jean-Pierre Delville

  • Centre de Physique Moléculaire Optique et Hertzienne (UMR CNRS 5798), Université Bordeaux I, 351 cours de la Libération, 33405 Talence Cedex, France

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Issue

Vol. 77, Iss. 6 — June 2008

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