Acoustic radiation force on a sphere in standing and quasi-standing zero-order Bessel beam tweezers

Mitri, F.G.

doi:10.1016/j.aop.2008.01.011

Cited by 76 publications

(22 citation statements)

References 79 publications

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“…An approach that could be used for manipulation in a similar manner was proposed and demonstrated by Yamakoshi & Noguchi (1998): two curved piezoelectric plates were placed next to each other with a common centre of curvature and driven out of phase resulting in a field with a node along the axis perpendicular to the centre of the pair of plates and anti-nodes either side, allowing 30 mm-diameter polystyrene spheres to be trapped against a fluid flow perpendicular to the node. Recent theoretical work suggests that the versatility of acoustic tweezers may be improved by the use of Bessel beams (Marston 2006;Mitri 2008).…”

Section: Introductionmentioning

confidence: 99%

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

et al. 2011

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The ability to manipulate dense micrometre-scale objects in fluids is of interest to biosciences with a view to improving analysis techniques and enabling tissue engineering. A method of trapping micrometre-scale particles and manipulating them on a twodimensional plane is proposed and demonstrated. Phase-controlled counter-propagating waves are used to generate ultrasonic standing waves with arbitrary nodal positions. The acoustic radiation force drives dense particles to pressure nodes. It is shown analytically that a series of point-like traps can be produced in a two-dimensional plane using two orthogonal pairs of counter-propagating waves. These traps can be manipulated by appropriate adjustment of the relative phases. Four 5 MHz transducers (designed to minimize reflection) are used as sources of counter-propagating waves in a waterfilled cavity. Polystyrene beads of 10 mm diameter are trapped and manipulated. The relationship between trapped particle positions and the relative phases of the four transducers is measured and shown to agree with analytically derived expressions. The force available is measured by determining the response to a sudden change in field and found to be 30 pN, for a 30 V pp input, which is in agreement with the predictions of models of the system. A scalable fabrication approach to producing devices is demonstrated.

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Section: Introductionmentioning

confidence: 99%

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

et al. 2011

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“…Particle manipulation in this method is achieved by physical displacement of the transducers generating the field. A development of this approach based on manipulation by propagating Bessel beams was analysed in the work of Marston (2006) and Mitri (2008). In the method based on linear arrays, two-dimensional traps are formed by activating selected elements of the array opposing a passive reflector (Kozuka et al 1998; Démoré et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Proof of principle study of ultrasonic particle manipulation by a circular array device

et al. 2012

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A feasibility study of a circular ultrasonic array device for acoustic particle manipulation is presented. A general approach based on Green's function is developed to analyse the underlying properties of a circular acoustic array. It allows the size of a controllable device area as a function of the number of array elements to be established and the array excitation required to produce a desired field distribution to be determined. A set of quantitative parameters characterizing the complexity of the pressure landscape is suggested, and relation to the number of array elements is found. Next, a finite-element model of a physically realizable circular piezo-acoustic array device is employed to demonstrate that the trapping capability can be achieved in practice.

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“…This has also been observed in the context of (zerothorder) Bessel beam tweezers. 43 Note that for kr 0 $ 1, the first "island" is reduced in size over ka. This also applies to the second "island" when moving from left to right.…”

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confidence: 98%

Near-field single tractor-beam acoustical tweezers

Mitri

2013

Applied Physics Letters

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The possibility to trap a sphere in the near-field of a single-beam piston transducer is theoretically demonstrated. Conditions are found where a rigid, fluid, elastic, and viscoelastic sphere with arbitrary radius placed in the near-field and centered on the axis of a circular piezoelectric transducer vibrating uniformly, experiences a pulling force, so the acoustical waves act as a “tractor” beam. Numerical predictions illustrate the theory with particular emphasis on the distance from the source, the size of the transducer, and the elastic properties of the sphere. Those results can potentially suggest a simple and reliable method in designing acoustical tweezers.

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Acoustic radiation force on a sphere in standing and quasi-standing zero-order Bessel beam tweezers

Cited by 76 publications

References 79 publications

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

Proof of principle study of ultrasonic particle manipulation by a circular array device

Near-field single tractor-beam acoustical tweezers

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