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Updated: Aug 26, 2026

Controllable Nucleation of Cavitation from Plasmonic Gold Nanoparticles for Enhancing High Intensity Focused Ultrasound Applications
Published on: October 5, 2018
Covert cavitation: Spectral peak suppression in the acoustic emissions from spatially configured nucleations
Jae Hee Song1, Kristoffer Johansen1, Paul Prentice1
1Cavitation Laboratory (CavLab), Medical and Industrial Ultrasonics, School of Engineering, University of Glasgow, Glasgow, G12 8QQ, United Kingdom JaeHee.Song@glasgow.ac.uk, k.johansen.1@research.gla.ac.uk, Paul.Prentice@glasgow.ac.uk.
Abstract:
Dual laser-nucleation is used to precisely configure two cavitation bubbles within a focused ultrasound field of f0 = 692 kHz, in proximity to the tip of a needle hydrophone. With both bubbles responding in the f0/2 sub-harmonic regime, confirmed via ultra-high speed shadowgraphic imaging, an emission spectrum with no sub-harmonic content is demonstrated, for an inter-bubble spacing ≈λ0. A spectral model for periodic shock waves from multiple nucleations demonstrates peak suppressions at nf0/2 when applied to the experiment, via a windowing effect in the frequency domain. Implications for single-element passive detection of cavitation are discussed.
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