Acoustic Lock: Position and orientation trapping of non-spherical sub-wavelength particles in mid-air using a single-axis acoustic levitator

Cox, Luke; Croxford, Anthony J.; Drinkwater, Bruce W.; Marzo, Asier

doi:10.1063/1.5042518

Cited by 58 publications

(30 citation statements)

References 26 publications

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“…Twin traps and vortices can create converging forces along the direction of propagation (i.e., z axis); however, this force was not enough to levitate the particles since it can be more than 30× weaker than the lateral forces (46). Hence, we adopted a time-multiplexing approach between twin traps (to orientate) and focal points (to generate enough trapping force); this approach has been recently demonstrated for one particle (47) but here we show that it can be used for multiple particles to achieve independent control of particle orientation. In Fig.…”

Section: Resultsmentioning

confidence: 98%

Holographic acoustic tweezers

Marzo

Drinkwater

2018

Proc. Natl. Acad. Sci. U.S.A.

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SignificanceHolographic optical tweezers use focused light to manipulate multiple objects independently without contact. They are used in tasks such as measuring the spring constant of DNA, the pulling force of the kinesin protein, or to trap matter in exotic states. Differently, acoustic tweezers use sound radiation forces to trap particles at a larger scale (i.e., from micrometers to centimeters). However, previous implementations did not provide individual control. We present the realization of holographic acoustic tweezers. Using an array of sound emitters, we engineer the generated sound field to manipulate multiple particles individually. This enables applications in contactless assembly both at the micrometer and centimeter scale as well as the creation of displays in which the pixels are levitating particles.

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Section: Resultsmentioning

confidence: 98%

Holographic acoustic tweezers

Marzo

Drinkwater

2018

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

401

261

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“…In many cases this is not significant but where samples are nonspherical, such as insects, or where liquid crystal structure is to be determined this is an important factor which must be considered. In Acoustic Lock: Position and orientation trapping of non-spherical sub-wavelength particles in mid-air using a single-axis acoustic levitator [42] a variation on the single axis levitator system was reported that saw each transducer 'bowl' divided into two symmetric halves with an invertible phase to facilitate the emission of both vertical standing waves and twintraps, where the confining force is also applied laterally. It was shown that the system could stop the rotation in a supplementary video showing the effect on solid objects and by way of example insects.…”

Section: The Liquid Levitation Era Beginsmentioning

confidence: 99%

“…In Acoustic Lock: Position and orientation trapping of non-spherical sub-wavelength particles in mid-air using a single-axis acoustic levitator [42] there was mention in the supplementary material of the levitation of liquids. This made important reference to the shape of the resulting confined droplet: it was found that the droplet formed an approximate ovoid and the boundary of the liquid appeared less smooth.…”

Section: New Perspectives -The Future Of Acoustic Levitation Of Liquidsmentioning

confidence: 99%

Beyond the Langevin horn: Transducer arrays for the acoustic levitation of liquid drops

et al. 2019

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The acoustic levitation of liquid drops has been a key phenomenon for more than 40 years, driven partly by the ability to mimic a microgravity environment. It has seen more than 700 research articles published in this time and has seen a recent resurgence in the past 5 years thanks to low cost developments. As well as investigating the basic physics of levitated drops, acoustic levitation has been touted for container free delivery of samples to a variety of measurements systems, most notably in various spectroscopy techniques including Raman, Fourier Transform InfraRed (FTIR) in addition to numerous X-Ray techniques. For 30 years the workhorse of the acoustic levitation apparatus was a stack comprising a piezoelectric transducer coupled to a horn shaped radiative element often referred to as the Langevin horn. Decades of effort have been dedicated to such devices, paired with a matching and opposing device or a reflector, but they have a significant dependence on temperature and require precision alignment. The last decade has seen a significant shift away from these in favour of arrays of digitally driven, inexpensive transducers, giving a new dynamic to the topic which we review herein.

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“…This technique can be applied to a wide range of particles, as any particle that fits within the trough is trapped. This could allow the design of a hologram for movement of a specific shape of object without rotation (e.g., a cube could be held with a square-shaped ridge) and without the need for switching electronics [36] or the significant complex computation [37] that previous techniques have involved. Furthermore, while the acoustic field required is more complex in form relative to focal trapping, there is no additional challenge in manufacturing the hologram and no increase in the electrical complexity.…”

Section: Phase-circle Manipulationmentioning

confidence: 99%

Acoustic Hologram Enhanced Phased Arrays for Ultrasonic Particle Manipulation

et al. 2019

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The ability to shape ultrasound fields is important for particle manipulation, medical therapeutics, and imaging applications. If the amplitude and/or phase is spatially varied across the wave front, then it is possible to project "acoustic images." When attempting to form an arbitrary desired static sound field, acoustic holograms are superior to phased arrays due to their significantly higher phase fidelity. However, they lack the dynamic flexibility of phased arrays. Here, we demonstrate how to combine the high-fidelity advantages of acoustic holograms with the dynamic control of phased arrays in the ultrasonic frequency range. Holograms are used with a 64-element phased array, driven with continuous excitation. Movement of the position of the projected hologram via phase delays that steer the output beam is demonstrated experimentally. This allows the creation of a much more tightly focused point than with the phased array alone, while still being reconfigurable. It also allows the complex movement at a water-air interface of a "phase surfer" along a phase track or the manipulation of a more arbitrarily shaped particle via amplitude traps. Furthermore, a particle manipulation device with two emitters and a single split hologram is demonstrated that allows the positioning of a "phase surfer" along a one-dimensional axis. This paper opens the door for new applications with complex manipulation of ultrasound while minimizing the complexity and cost of the apparatus.

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Acoustic Lock: Position and orientation trapping of non-spherical sub-wavelength particles in mid-air using a single-axis acoustic levitator

Abstract: Acoustic Lock: Position and orientation trapping of non-spherical subwavelength particles in mid-air using a single-axis acoustic levitator. Applied Physics Letters, 113(5), [054101].

Cited by 58 publications

References 26 publications

Holographic acoustic tweezers

Holographic acoustic tweezers

Beyond the Langevin horn: Transducer arrays for the acoustic levitation of liquid drops

Acoustic Hologram Enhanced Phased Arrays for Ultrasonic Particle Manipulation

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