Nanometer-Resolved Collective Micromeniscus Oscillations through Optical Diffraction

Details Nanometer-Resolved Collective Micromeniscus Oscillations through Optical Diffraction Nanometer-Resolved Collective Micromeniscus Oscillations through Optical Diffraction

2007-07-17

arxiv.org/abs/0707.2464v2

Phys. Rev. Lett. 99, 214501 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.99.214501

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 sub-microsecond time resolution. Upon driving the system with an ultrasound field at variable frequency we observe a pronounced resonance at a few hundred kHz, depending on the exact geometry. 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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