Acoustic radiation force on a rigid cylinder in a focused Gaussian beam

Azarpeyvand, Mahdi; Azarpeyvand, Mohammad

doi:10.1016/j.jsv.2012.11.002

Cited by 43 publications

(19 citation statements)

References 54 publications

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“…not a force of attraction). In some situations, theoretical predictions have demonstrated the existence of a negative (pulling) force on a rigid cylinder in a focused Gaussian beam [42] (and spheres as well [43,44]), however, the mathematical expression for the incident Gaussian beam provided therein differs from Eq. (2).…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Pseudo-Gaussian cylindrical acoustical beam – Axial scattering and radiation force on an elastic cylinder

Mitri¹,

Fellah²,

Silva³

2014

Journal of Sound and Vibration

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a b s t r a c tMaking use of the addition theorem for the cylindrical wave functions and the complexsource-point method in cylindrical coordinates, an exact solution to the Helmholtz equation is derived, which corresponds to a tightly focused (or collimated) cylindrical quasi-Gaussian beam with arbitrary waist. The solution is termed "quasi-Gaussian" to make a distinction from the standard Gaussian beam solution obtained in the paraxial approximation. The advantage of introducing this new solution is the efficient and fast computational modeling of tightly focused or quasi-collimated cylindrical wave-fronts depending on the dimensionless waist parameter kw 0 , where k is the wavenumber of the acoustical radiation. Moreover, a closed-form partial-wave series expansion is obtained for the incident field, which has the property that the axial scattering (i.e. along the direction of wave propagation) and the axial acoustic radiation force (which is a time-averaged quantity) on a cylinder, can be calculated without any approximations in the limit of linear acoustical waves in a nonviscous fluid. Examples are found where the extinction in the radiation force function plot is found to be correlated with conditions giving reduction of the backscattering from an elastic cylinder. Those results are useful in beam-forming design, particle manipulation in acoustic tweezers operating with focused cylindrical beams, and the prediction of the scattering and radiation forces on a cylindrical particle or liquid bridges.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Pseudo-Gaussian cylindrical acoustical beam – Axial scattering and radiation force on an elastic cylinder

Mitri¹,

Fellah²,

Silva³

2014

Journal of Sound and Vibration

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“…It has been demonstrated that SBAT could trap the objects with a size either larger or smaller than an acoustic wavelength. 152,153 Hwang et al proposed a non-contact single-beam acoustic trapping method for the quantification of the mechanical properties of a suspended cell without any materials attached to the cell ( Fig. 16(b)).…”

Section: E Acoustic Trapsmentioning

confidence: 99%

Microfluidics cell sample preparation for analysis: Advances in efficient cell enrichment and precise single cell capture

et al. 2017

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Single cell analysis has received increasing attention recently in both academia and clinics, and there is an urgent need for effective upstream cell sample preparation. Two extremely challenging tasks in cell sample preparation-highefficiency cell enrichment and precise single cell capture-have now entered into an era full of exciting technological advances, which are mostly enabled by microfluidics. In this review, we summarize the category of technologies that provide new solutions and creative insights into the two tasks of cell manipulation, with a focus on the latest development in the recent five years by highlighting the representative works. By doing so, we aim both to outline the framework and to showcase example applications of each task. In most cases for cell enrichment, we take circulating tumor cells (CTCs) as the target cells because of their research and clinical importance in cancer. For single cell capture, we review related technologies for many kinds of target cells because the technologies are supposed to be more universal to all cells rather than CTCs. Most of the mentioned technologies can be used for both cell enrichment and precise single cell capture. Each technology has its own advantages and specific challenges, which provide opportunities for researchers in their own area. Overall, these technologies have shown great promise and now evolve into real clinical applications. Published by AIP Publishing. [http://dx

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“…10,11 On the other hand, the present analysis is based on the partial-wave series expansion (PWSE) method (known also as normal-mode decomposition in Fourier series) in cylindrical coordinates, and the evaluation of the beam-shape coefficients (BSCs) stemming from Graf's additional theorem for the cylindrical wave functions, without the need of numerical integration procedures, used previously in the method of the angular spectrum decomposition into plane waves, or in the computation of the acoustic radiation force on a rigid (sound impenetrable) cylinder. 12 It is also worth mentioning that the formalisms for the electromagnetic scattering of optical beams by (dielectric or perfectly conducting) cylindrical objects have used the angular spectrum and PWSE methods with numerical integration in several studies. [13][14][15][16][17][18] Nonetheless, the extension to predict and numerically compute the resonance scattering as well as the resulting acoustic radiation force using an exact method such as Graf's additional theorem, remains to be accomplished, which is developed here in this investigation.…”

Section: Introductionmentioning

confidence: 99%

Resonance scattering and radiation force calculations for an elastic cylinder using the translational addition theorem for cylindrical wave functions

Mitri

2015

AIP Advances

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The standard Resonance Scattering Theory (RST) of plane waves is extended for the case of any two-dimensional (2D) arbitrarily-shaped monochromatic beam incident upon an elastic cylinder with arbitrary location using an exact methodology based on Graf's translational addition theorem for the cylindrical wave functions. The analysis is exact as it does not require numerical integration procedures. The formulation is valid for any cylinder of finite size and material that is immersed in a nonviscous fluid. Partial-wave series expansions (PWSEs) for the incident, internal and scattered linear pressure fields are derived, and the analysis is further extended to obtain generalized expressions for the on-axis and off-axis acoustic radiation force components. The wave-fields are expressed using generalized PWSEs involving the beam-shape coefficients (BSCs) and the scattering coefficients of the cylinder. The off-axial BSCs are expressed analytically in terms of an infinite PWSE with emphasis on the translational offset distance d. Numerical computations are considered for a zeroth-order quasi-Gaussian beam chosen as an example to illustrate the analysis. Acoustic resonance scattering directivity diagrams are calculated by subtracting an appropriate background from the expression of the scattered pressure field. In addition, computations for the radiation force exerted on an elastic cylinder centered on the axis of wave propagation of the beam, and shifted off-axially are analyzed and discussed. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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Acoustic radiation force on a rigid cylinder in a focused Gaussian beam

Cited by 43 publications

References 54 publications

Pseudo-Gaussian cylindrical acoustical beam – Axial scattering and radiation force on an elastic cylinder

Pseudo-Gaussian cylindrical acoustical beam – Axial scattering and radiation force on an elastic cylinder

Microfluidics cell sample preparation for analysis: Advances in efficient cell enrichment and precise single cell capture

Resonance scattering and radiation force calculations for an elastic cylinder using the translational addition theorem for cylindrical wave functions

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