Low power sessile droplet actuation via modulated surface acoustic waves

Abstract

Low power actuation of sessile droplets is of primary interest for portable or hybrid lab-on-a-chip and harmless manipulation of biofluids. In this paper, we show that the acoustic power required to move or deform droplets via surface acoustic waves can be substantially reduced through the forcing of the drops inertio-capillary modes of vibrations. Indeed, harmonic, superharmonic and subharmonic (parametric) excitation of these modes are observed when the high frequency acoustic signal (19.5 MHz) is modulated around Rayleigh-Lamb inertio-capillary frequencies. This resonant behavior results in larger oscillations and quicker motion of the drops than in the non-modulated case.

References in corpus (2)

• Droplets displacement and oscillations induced by ultrasonic surface acoustic waves: a quantitative study
• Low power sessile droplet actuation via modulated surface acoustic waves

Cited by in corpus (5)

• Synthesis of anisotropic swirling surface acoustic waves by inverse filter, towards integrated generators of acoustical vortices
• Low power sessile droplet actuation via modulated surface acoustic waves
• Cyclones and attractive streaming generated by acoustical vortices
• Dynamics of sessile and pendant drop excited by surface acoustic waves: gravity effects and correlation between oscillatory and translational motions
• Harmonic and subharmonic waves on the surface of a vibrated liquid drop