Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses

Pérez-López, Sergio; Fuster, J.M.; Candelas, Pilar; Tarrazó-Serrano, Daniel; Castiñeira-Ibáñez, Sergio; Rubio, Constanza

doi:10.3390/s20030705

Cited by 11 publications

(6 citation statements)

References 33 publications

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“…Figure 1(b) shows a schematic of the inner BFZP consisting of two Fresnel zone plates (FZPs). The inner FZP with four concentric ring slits has a focal length of f 2 and the outer FZP with four concentric ring slits has a focal length of f 3 [41,42]. As an acoustic plane wave transmits through the BFZP, an axial bifocal acoustic beam (BAB) with two focal points of f 2 and f 3 can be formed.…”

Section: Hybrid Acoustic Artificial Plate For Generating a Three-dime...mentioning

confidence: 99%

Three-Dimensional Trapping and Manipulation of a Mie Particle by Hybrid Acoustic Focused Petal Beams

Luo

et al. 2022

Phys. Rev. Applied

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Acoustic manipulations of microparticles have significant implications in physics, chemistry, biology, and biomedicine. For large Mie particles, both the scattering force and the gradient force affect the trapping and manipulation behaviors, and thus, a passive acoustic tweezer (AT) for three-dimensionally manipulating a Mie particle remains challenging. Here, a passive AT based on a hybrid acoustic artificial plate is proposed to generate a hybrid acoustic focused petal beam (HAFPB) for capturing and manipulating a Mie microparticle in three dimensions. In the HAFPB, a lateral acoustic focused petal beam and an axial bifocal acoustic beam (BAB) combine to create a central zero-intensity zone for particle trapping, which can be adjusted by modulating the topological charge of the HAFPB. The acoustic radiation forces (ARFs) acting on large Mie particles with different diameters are investigated. The ARFs on the polystyrene sphere are greatly influenced by the particle size. If the particle is larger than the central zero-intensity zone, an AT with a larger topological charge and a stronger BAB is required for trapping and manipulating this larger particle. Finally, the experiments demonstrate that the AT can stably trap and manipulate a large Mie particle in three dimensions in water.

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Section: Hybrid Acoustic Artificial Plate For Generating a Three-dime...mentioning

confidence: 99%

Three-Dimensional Trapping and Manipulation of a Mie Particle by Hybrid Acoustic Focused Petal Beams

Luo

et al. 2022

Phys. Rev. Applied

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“…To overcome these disadvantages of phased arrays, studies have investigated methods for controlling the focal length by the operating frequency using a Fresnel zone plate (FZP), in which several rings are arranged concentrically on a plane [15][16][17][18] . For example, Fuster et al measured the sound eld in a water tank after installing metal FZP lenses at a distance of 35 cm from a planar ultrasonic transducer, and they found that the focal length depends almost linearly on the operating frequency 18 .…”

Section: Introductionmentioning

confidence: 99%

“…For example, Fuster et al measured the sound eld in a water tank after installing metal FZP lenses at a distance of 35 cm from a planar ultrasonic transducer, and they found that the focal length depends almost linearly on the operating frequency 18 . The disadvantage of an FZP-based acoustic lens [15][16][17][18][19] is that it requires a space between the planar transducer and itself, thus increasing the space between the transducer and tumor. FUS transducers generally operate at high frequencies above 0.8 MHz.…”

Section: Introductionmentioning

confidence: 99%

“…As an alternative, studies have investigated methods for manufacturing a focused transducer, in which an FZP-patterned electrode is placed on a piezoelectric plate [20][21] . However, studies [15][16][17][18][19][20][21] that applied the classical FZP had an inherent limitation in that the inner and outer radii of the FZP pattern were automatically determined by the operating frequency and focal distance, and space for an image probe for the FUS treatment was not secured.…”

Section: Introductionmentioning

confidence: 99%

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Design and Realization of Void-centric Zone Plate Ultrasonic Transducer: Considering Structural Vibration of Piezoelectric Metamaterials

Sim

Elmina

Kim

et al. 2023

Preprint

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We developed and experimentally realized a novel type of focal transducer called a void-centric zone plate ultrasonic transducer (VZPUT). Although VZPUT is a planar transducer, it can focus ultrasound and control the focal length using a single-channel electric network. Further, unlike a classical Fresnel zone plate, the VZPUT has space for an imaging probe at the center, making it useful for therapeutic focused ultrasound (FUS). To realize VZPUT, we develop a novel void-centric zone plate (VZP) that allows design freedom for the radius of the space at the center. Then, we fabricate the piezoelectric VZP, an acoustic metamaterial, considering its structural vibration modes that appear within the operating frequency range. The VZPUT demonstrated applicability to therapeutic FUS in that it could control the focal point by the operating frequency with real-time monitoring images from the imaging probe mounted at the center.

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“…For example, in the case of Fibonacci sequences, the ratio between both foci is z 2 /z 1 = 1/(ϕ 2 − 1), with ϕ 2 = (1 + √ 5)/2 being the golden mean. Other alternative methods for providing bifocal profiles based on combining preexisting Fresnel ZPs have also been proposed in [28], but they require a complex design process with an accurate control of the phase interference pattern.…”

Section: Introductionmentioning

confidence: 99%

Design of Acoustic Bifocal Lenses Using a Fourier-Based Algorithm

Fuster¹,

Pérez-López²,

Candelas³

2021

Sensors

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In this work, we develop a new design method based on fast Fourier transform (FFT) for implementing zone plates (ZPs) with bifocal focusing profiles. We show that the FFT of the governing binary sequence provides a discrete sequence of the same length, which indicates the location of the main foci at the ZP focusing profile. Then, using reverse engineering and establishing a target focusing profile, we are capable of generating a binary sequence that provides a ZP with the desired focusing profile. We show that this design method, based on the inverse fast Fourier transform (IFFT), is very flexible and powerful and allows to tailor the design of bifocal ZPs to achieve focusing profiles with the desired foci locations and resolutions. The key advantage of our design algorithm, compared to other alternatives presented in previous works, is that our method provides bifocal focusing profiles with an absolute control of the foci locations. Moreover, although we analyze the performance of this novel design algorithm for underwater ultrasonics, it can also be successfully extended to different fields of physics, such as optics or microwaves, where ZPs are widely employed.

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Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses

Cited by 11 publications

References 33 publications

Three-Dimensional Trapping and Manipulation of a Mie Particle by Hybrid Acoustic Focused Petal Beams

Three-Dimensional Trapping and Manipulation of a Mie Particle by Hybrid Acoustic Focused Petal Beams

Design and Realization of Void-centric Zone Plate Ultrasonic Transducer: Considering Structural Vibration of Piezoelectric Metamaterials

Design of Acoustic Bifocal Lenses Using a Fourier-Based Algorithm

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