Coaxial Transducer

Ruffa, Anthony A.

doi:10.1121/1.3696732

Cited by 1 publication

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“…Resonators used to realize acoustic metamaterials include traditional Helmholtz and cavity resonators, which have long been used for filtering [6] and sound attenuation [7], as well as membranes, rubber-coated particles and space-coiling structures [5,8,9]. Bubbles, whose acoustic properties have been extensively studied in the context of bubbly liquids [10], bio-medical applications [11] and soft-matter physics [12], have also been used to demonstrate a range of phononic-crystal and metamaterial effects underwater [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Acoustics of bubbles trapped in microgrooves: From isolated subwavelength resonators to superhydrophobic metasurfaces

2019

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We study the acoustic response of flat-menisci bubbles trapped in the grooves of a microstructured hydrophobic substrate immersed in water. In the first part of the paper we consider a single bubble subjected to a normally incident plane wave. We use the method of matched asymptotic expansions, based on the smallness of the gas-to-liquid density ratio, to describe the near-field of the groove, where the compressibility of the liquid can be neglected, and an acoustic region, on the scale of the wavelength, which is much larger than the groove opening in the resonance regime of interest. We find that bubbles trapped in grooves support multiple subwavelength resonances, which are damped -radiatively -even in the absence of dissipation. Beyond the fundamental resonance, at which the pinned meniscus is approximately parabolic, we find a sequence of higher-order anti-resonance and resonance pairs; at the anti-resonances (whose frequencies are independent of the gas properties and groove size) the gas is idle and the scattering vanishes, while

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