Observation of Orbital Angular Momentum Transfer from Bessel-Shaped Acoustic Vortices to Diphasic Liquid-Microparticle Mixtures

Hong, Zhenyu; Zhang, Jie; Drinkwater, Bruce W.

doi:10.1103/physrevlett.114.214301

Cited by 152 publications

(85 citation statements)

References 42 publications

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“…What was not made clear previously was that a single standing wave mode does not exhibit this rotation of active intensity. To achieve rotational active intensity in a two-dimensional sound field it is typically necessary to have a line or point pressure minimum [56][57][58] This can result from the superposition of a travelling and standing wave (see below) or of two standing waves. This is supported with reference to our previous models [48][49][50], where we find that if the radiation boundary conditions (which allowed for the passage of energy across them, but still reflected a proportion of that energy to create combinations of standing and travelling waves), are replaced with rigid or free boundary conditions, the rotational patterns vanish.…”

Section: Analytical Modelmentioning

confidence: 99%

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

2017

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While classical Rayleigh streaming, whose circulations are perpendicular to the transducer radiating surfaces, is wellknown, transducer-plane streaming patterns, in which vortices circulate parallel to the surface driving the streaming, have been less widely discussed. Previously, a four-quadrant transducer-plane streaming pattern has been seen experimentally and subsequently investigated through numerical modelling. In this paper, we show that by considering higher order threedimensional cavity modes of rectangular channels in thin-layered acoustofluidic manipulation devices, a wider family of transducer-plane streaming patterns are found. As an example, we present a transducer-plane streaming pattern, which consists of eight streaming vortices with each occupying one octant of the plane parallel to the transducer radiating surfaces, which we call here eight-octant transducer-plane streaming. An idealised modal model is also presented to highlight and explore the conditions required to produce rotational patterns. It is found that both standing and travelling wave components are typically necessary for the formation of transducer-plane streaming patterns. In addition, other streaming patterns related to acoustic vortices and systems in which travelling waves dominate are explored with implications for potential applications. DOI:I. INTRODUCTION Acoustic streaming is steady fluid motion driven by the absorption of acoustic energy due to the interaction of acoustic waves with the fluid medium or its solid boundaries. Understanding the driving mechanisms of acoustic streaming patterns within acoustofluidic devices is important in order to precisely control it for the enhancement or suppression of acoustic streaming for applications such as particle/cell manipulation [1-8], heat transfer enhancement [9-12], noncontact surface cleaning [13][14][15][16][17], microfluidic mixing [18][19][20][21][22][23][24][25][26][27], and transport enhancement [28][29][30][31][32][33][34][35].In most bulk micro-acoustofluidic particle and cell manipulation systems of interest, the acoustic streaming fields are dominated by boundary-driven streaming [36], which is associated with acoustic dissipation in the viscous boundary layer [37]. Theoretical work on boundary-driven streaming was initiated by Rayleigh [38], and developed by a series of modifications for particular cases [39][40][41][42][43][44], which have paved the fundamental understanding of acoustic streaming flows.While Rayleigh streaming patterns (which have streaming vortices with components perpendicular to the driving boundaries) have been extensively studied [45][46][47][48], we have recently explored the mechanisms behind fourquadrant transducer-plane streaming [49] which generates streaming vortices in planes parallel to the driving boundary, and modal Rayleigh-like streaming [50] in which vortices have a roll size greater than the quarter wavelength of the main acoustic resonance and are driven by limiting velocities (the value of the streaming velocity just outside...

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Section: Analytical Modelmentioning

confidence: 99%

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

2017

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“…Passive acoustic phase modulation structures were proposed to generate single-charge vortex beams (22)(23)(24)(25). These acoustic vortex beams were used to develop acoustic tweezers, and screwdrivers for particle trapping, levitation, and manipulations (26)(27)(28)(29)(30). However, information encoding through multiple OAM channels multiplexing/demultiplexing remains unexplored.…”

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confidence: 99%

High-speed acoustic communication by multiplexing orbital angular momentum

Shi

Dubois

Wang

et al. 2017

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

257

111

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Long-range acoustic communication is crucial to underwater applications such as collection of scientific data from benthic stations, ocean geology, and remote control of off-shore industrial activities. However, the transmission rate of acoustic communication is always limited by the narrow-frequency bandwidth of the acoustic waves because of the large attenuation for high-frequency sound in water. Here, we demonstrate a high-throughput communication approach using the orbital angular momentum (OAM) of acoustic vortex beams with one order enhancement of the data transmission rate at a single frequency. The topological charges of OAM provide intrinsically orthogonal channels, offering a unique ability to multiplex data transmission within a single acoustic beam generated by a transducer array, drastically increasing the information channels and capacity of acoustic communication. A high spectral efficiency of 8.0 ± 0.4 (bit/s)/Hz in acoustic communication has been achieved using topological charges between −4 and +4 without applying other communication modulation techniques. Such OAM is a completely independent degree of freedom which can be readily integrated with other state-of-the-art communication modulation techniques like quadrature amplitude modulation (QAM) and phaseshift keying (PSK). Information multiplexing through OAM opens a dimension for acoustic communication, providing a data transmission rate that is critical for underwater applications.high-speed acoustic communication | high spectral efficiency | orbital angular momentum | multiplexing | demultiplexing W ith the increasing amount of human activities underwater including unmanned vehicle exploration, off-shore industrial applications, and remote ocean environment monitoring, the development of underwater communication has become essential. The intrinsic strong absorption of microwave and mid-and far-infrared radiations by water molecules limits the propagation distance of radio frequencies to mere centimeters (1-4), making rf wireless communication approaches impossible. On the other hand, optical waves are scattered by objects in the ocean such as small particles, debris, and marine life due to the shorter wavelengths, limiting the range of optical communication underwater to be within just 200 m (5-7). Presently, acoustic waves are the only option for long-range (over 200 m) underwater communications. However, the applicable bandwidth of acoustic waves is limited within 20 kHz because the higher damping loss of high-frequency acoustic waves in water reduces the propagation distance to less than a kilometer range (8). Such a low carrier frequency limits drastically the spectral bandwidth and data rate accessible for data transmission. Although spectral efficiency has been improved through recent advanced communication technologies such as differential phase-shift keying (PSK) and quadrature amplitude modulation (QAM), the number of available data transmission channels remains tied to the low carrier frequency (9-13).We propose to overcome such ...

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“…If the source is made of a set of independent transducers, electronic steering of the beam is feasible, such as spatial light modulators in optics [50]. Moreover, acoustical vortices carry a quantified orbital angular momentum [39,40] that can be transferred to matter [42][43][44][45][46]52,53], so controlled rotation of absorbing particles is expected to provide a 4th degree of freedom for contactless manipulation and forms the basis of an undergoing study.…”

Section: H Y S I C a L R E V I E W L E T T E R S Week Endingmentioning

confidence: 99%

“…Field synthesis.-These peculiar wave fields have been successfully generated in acoustics [39][40][41] and applied to investigate the transfer of orbital angular momentum to matter [42][43][44][45][46]. In Fig.…”

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A One-Sided View of Acoustic Traps

Hill

2016

Physics

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We demonstrate the trapping of elastic particles by the large gradient force of a single acoustical beam in three dimensions. Acoustical tweezers can push, pull and accurately control both the position and the forces exerted on a unique particle. Forces in excess of 1 micronewton were exerted on polystyrene beads in the submillimeter range. A beam intensity less than 50 W=cm 2 was required, ensuring damage-free trapping conditions. The large spectrum of frequencies covered by coherent ultrasonic sources provides a wide variety of manipulation possibilities from macroscopic to microscopic length scales. Our observations could open the way to important applications, in particular, in biology and biophysics at the cellular scale and for the design of acoustical machines in microfluidic environments.

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Observation of Orbital Angular Momentum Transfer from Bessel-Shaped Acoustic Vortices to Diphasic Liquid-Microparticle Mixtures

Cited by 152 publications

References 42 publications

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

Transducer-Plane Streaming Patterns in Thin-Layer Acoustofluidic Devices

High-speed acoustic communication by multiplexing orbital angular momentum

A One-Sided View of Acoustic Traps

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