Visualization of Surface Acoustic Waves in Thin Liquid Films.

Abstract:

:We demonstrate that the propagation path of a surface acoustic wave (SAW), excited with an interdigitated transducer (IDT), can be visualized using a thin liquid film dispensed onto a lithium niobate (LiNbO3) substrate. The practical advantages of this visualization method are its rapid and simple implementation, with many potential applications including in characterising acoustic pumping within microfluidic channels. It also enables low-cost characterisation of IDT designs thereby allowing the determination of anisotropy and orientation of the piezoelectric substrate without the requirement for sophisticated and expensive equipment. Here, we show that the optical visibility of the sound path critically depends on the physical properties of the liquid film and identify heptane and methanol as most contrast rich solvents for visualization of SAW. We also provide a detailed theoretical description of this effect.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Rambach RW,Taiber J,Scheck CM,Meyer C,Reboud J,Cooper JM,Franke T

doi

10.1038/srep21980

subject

Has Abstract

pub_date

2016-02-26 00:00:00

pages

21980

issn

2045-2322

pii

srep21980

journal_volume

6

pub_type

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