Optohydrodynamics of soft fluid interfaces : Optical and viscous nonlinear effects

Abstract

Recent experimental developments showed that the use of the radiation pressure, induced by a continuous laser wave, to control fluid-fluid interface deformations at the microscale, represents a very promising alternative to electric or magnetic actuation. In this article, we solve numerically the dynamics and steady state of the fluid interface under the effects of buoyancy, capillarity, optical radiation pressure and viscous stress. A precise quantitative validation is shown by comparison with experimental data. New results due to the nonlinear dependence of the optical pressure on the angle of incidence are presented, showing different morphologies of the deformed interface going from needle-like to finger-like shapes, depending on the refractive index contrast. In the transient regime, we show that the viscosity ratio influences the time taken for the deformation to reach steady state.

References in corpus (5)

• Momentum of an electromagnetic wave in dielectric media
• Laser-induced hydrodynamic instability of fluid interfaces
• Asymmetric Optical Radiation Pressure Effects on Liquid Interfaces Under Intense Illumination
• Simulation of an optically induced asymmetric deformation of a liquid-liquid interface
• Non-Linear Deformations of Liquid-Liquid Interfaces Induced by Electromagnetic Radiation Pressure

Cited by in corpus (4)

• Eddies and interface deformations induced by optical streaming
• Theory of microdroplet and microbubble deformation by Gaussian laser beam
• Near-critical spreading of droplets
• Numerical simulation of universal morphogenesis of fluid interface deformations driven by radiation pressure