Nanometer-Resolved Collective Micromeniscus Oscillations through Optical Diffraction


Rathgen, Helmut and Sugiyama, Kazuyasu and Ohl, Claus-Dieter and Lohse, Detlef and Mugele, Frieder (2007) Nanometer-Resolved Collective Micromeniscus Oscillations through Optical Diffraction. Physical Review Letters, 99 (21). p. 214501. ISSN 0031-9007

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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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Copyright:© 2007 The American Physical Society
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