Acoustics of Bubble Arrays: Role Played by the Dipole Response of Bubbles

Leroy, Valentin; Chastrette, Nicolas; Thieury, Margaux; Lombard, Olivier; Tourin, Arnaud

doi:10.3390/fluids3040095

Cited by 17 publications

(13 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To meet the requirements of portable biomedical devices, the bubble removal method can be implemented by other means, e.g., forced fluid flow of the electrolyte or on-chip reversal of the electrolysis 39 . Future work should explore multilevel amplitude or phase control of sound waves exploiting the resonant behavior of the microbubbles at specifically controlled sizes 40 – 43 . Spatial ultrasound modulators extend the capabilities of ultrasound applications and will be essential for medical imaging 13 , 44 , nondestructive testing 15 , holographic acoustic tweezers 8 , 25 , transcranial ultrasonic focusing 12 , acoustic fabrication 9 and cell assembly 10 .…”

Section: Discussionmentioning

confidence: 99%

Spatial ultrasound modulation by digitally controlling microbubble arrays

Melde

Athanassiadis

et al. 2020

Nat Commun

View full text Add to dashboard Cite

Acoustic waves, capable of transmitting through optically opaque objects, have been widely used in biomedical imaging, industrial sensing and particle manipulation. High-fidelity wave front shaping is essential to further improve performance in these applications. An acoustic analog to the successful spatial light modulator (SLM) in optics would be highly desirable. To date there have been no techniques shown that provide effective and dynamic modulation of a sound wave and which also support scale-up to a high number of individually addressable pixels. In the present study, we introduce a dynamic spatial ultrasound modulator (SUM), which dynamically reshapes incident plane waves into complex acoustic images. Its transmission function is set with a digitally generated pattern of microbubbles controlled by a complementary metal–oxide–semiconductor (CMOS) chip, which results in a binary amplitude acoustic hologram. We employ this device to project sequentially changing acoustic images and demonstrate the first dynamic parallel assembly of microparticles using a SUM.

show abstract

Section: Discussionmentioning

confidence: 99%

Spatial ultrasound modulation by digitally controlling microbubble arrays

Melde

Athanassiadis

et al. 2020

Nat Commun

View full text Add to dashboard Cite

show abstract

“…Another question is how to generalize our theory to elastic solid media containing bubbles. As the authors have demonstrated in [8][9][10][11], for elastic media with very low shear stress, the primary mechanism of the first band gap is still caused by the resonance of the bubble. Therefore, we believe that our theory can be generalized and applied to such a system without much difficulty.…”

Section: Absorption Effect and The Possibility Of Generalizationmentioning

confidence: 94%

Bubbly Water as a Natural Metamaterial of Negative Bulk-Modulus

Luan

2019

Crystals

View full text Add to dashboard Cite

In this study, an oscillator model of bubble-in-water is proposed to analyze the effective modulus of low-concentration bubbly water. We show that in a wide range of wave frequency the bubbly water acquires a negative effective modulus, while the effective density of the medium is still positive. These two properties imply the existence of a wide acoustic gap in which the propagation of acoustic waves in this medium is prohibited. The dispersion relation for the acoustic modes in this medium follows Lorentz type dispersion, which is of the same form as that of the phonon-polariton in an ionic crystal. Numerical results of the gap edge frequencies and the dispersion relation in the long-wavelength regime based on this effective theory are consistent with the sonic band results calculated with the plane-wave expansion method (PWEM). Our theory provides a simple mechanism for explaining the long-wavelength behavior of the bubbly water medium. Therefore, phenomena such as the high attenuation rate of sound or acoustic Anderson localization in bubbly water can be understood more intuitively. The effects of damping are also briefly discussed. This effective modulus theory may be generalized and applied to other bubble-in-soft-medium type sonic systems.

show abstract

“…In earlier works [6,7,42,43], it was shown that, in a hybrid structure, comprising a decorated membrane set on a closed cavity of depth d, the required impedance of the membrane that can lead to zero reflection (and total absorption) is given by…”

Section: Hybrid-membrane Resonator With the Partial Asbcmentioning

confidence: 99%