Nanometer-resolved collective micromeniscus oscillations through optical diffraction |
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Authors: | Rathgen Helmut Sugiyama Kazuyasu Ohl Claus-Dieter Lohse Detlef Mugele Frieder |
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Affiliation: | Physics of Complex Fluids, University of Twente, The Netherlands. helmut.rathgen@web.de |
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Abstract: | We study the dynamics of periodic arrays of micrometer-sized liquid-gas menisci formed at superhydrophobic surfaces immersed into water. By measuring the intensity of optical diffraction peaks in real time, we are able to resolve nanometer-scale oscillations of the menisci with submicrosecond time resolution. Upon driving the system with an ultrasound field at variable frequency, we observe a pronounced resonance at a few hundred kilohertz, depending on the exact geometry. By modeling the system using the unsteady Stokes equation, we find that this low resonance frequency is caused by a collective mode of the acoustically coupled oscillating menisci. |
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