On the use of phase correction rings on Fresnel zone plates with ultrasound piston emitters

Pérez-López, Sergio; Fuster, J.M.; Candelas, Pilar; Rubio, Constanza; Belmar, Francisco

doi:10.1063/1.5036712

Cited by 13 publications

(15 citation statements)

References 16 publications

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“…The design equation of the FZP radii can be obtained considering a λ /2 increase between the pressure propagation paths of two consecutive regions, which is equivalent to a π phase increase. Thus, the radii can be calculated using the following expression 16,30 :where d is the distance between the point source and the FZP, F is the focal distance, λ is the wavelength, r n is the radius of each region and n = 1, 2, 3, ..., N , being N the total number of Fresnel regions.…”

Section: Resultsmentioning

confidence: 99%

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Tarrazó-Serrano

Pérez-López

Candelas

et al. 2019

Sci Rep

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The development of flat acoustic lenses for different applications such as biomedical engineering is a topic of great interest. Flat lenses like Fresnel Zone Plates (FZPs) are capable of focusing energy beams without the need of concave or convex geometries, which are more difficult to manufacture. One of the possible applications of these type of lenses is tumor ablation through High Intensity Focused Ultrasound (HIFU) therapies with real time Magnetic Resonance Imaging (MRI) monitoring. In order to be MRI compatible, the FZP material cannot have electromagnetic interaction. In this work, a Phase-Reversal FZP (PR-FZP) made of Polylactic Acid (PLA) manufactured with a commercial 3D printer is proposed as a better, more efficient and MRI compatible alternative to conventional Soret FZPs. Phase-Reversal lenses, unlike traditional FZPs, take advantage of all the incident energy by adding phase compensation regions instead of pressure blocking regions. The manufactured PR-FZP achieves 21.9 dB of focal gain, which increases the gain compared to a Soret FZP of its same size by a factor of 4.0 dB. Both numerical and experimental results are presented, demonstrating the improved focusing capabilities of these types of lenses.

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Section: Resultsmentioning

confidence: 99%

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Tarrazó-Serrano

Pérez-López

Candelas

et al. 2019

Sci Rep

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“…In the experimental set-up, the distance between the transducer and lens is not large enough to consider the plane wave incidence. Therefore, the Fresnel radii have been calculated considering spherical wave incidence [32], that is,…”

Section: Bifzp Lens Designmentioning

confidence: 99%

Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses

Pérez-López

Fuster

Candelas

et al. 2020

Sensors

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In this work, we present a bifocal Fresnel zone plate (BiFZP) capable of generating focusing profiles with two different foci. The performance of the BiFZP is demonstrated in the ultrasound domain, with a very good agreement between the experimental measurements and the finite element method (FEM) simulations. This lens becomes an appealing alternative to other dual-focusing lenses, in which the foci location can only be set at a limited range of positions, such as M-bonacci zone plates. Moreover, the variation of the operating frequency has also been analyzed, providing an additional dynamic control parameter in this type of lenses.

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“…Although these type of lenses can be very interesting in certain applications, and they have shown focal tunability [7], they can only focus in very close range applications, which limits their potential. In this sense, a simpler device capable of focusing acoustic waves with higher flexibility is the Fresnel Zone Plate (FZP), which can be implemented either alternating blocking or absorbing regions with transparent regions [9,10], or alternating transparent with phase-reversal regions [11].…”

Section: Introductionmentioning

confidence: 99%

“…A FZP focuses waves through constructive interference of the diffracted field in its apertures. These devices can be found in all sorts of applications, such as optical trapping [12], planar antenna design [13], or ultrasound focusing applications [9,10,14]. In optics, the distance between the transducer and the lens is usually large enough to consider plane wave incidence.…”

Section: Introductionmentioning

confidence: 99%

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M-Bonacci Zone Plates for Ultrasound Focusing

Pérez-López¹,

Fuster²,

Candelas³

2019

Sensors

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In this work, we present a thorough analysis on M-bonacci zone plates for ultrasound focusing applications. These planar lenses are capable of providing bifocal focusing profiles with equal intensity in both foci and become very appealing for a wide range of scenarios including medical and industrial applications. We show that in high-wavelength domains, such as acoustics or microwaves, the separation between both foci can be finely adjusted at the expense of slightly increasing the distortion of the focusing profile, and we introduce a design parameter to deal with this issue and simplify the design process of these lenses. Experimental measurements are in good agreement with numerical simulations and demonstrate the potential of M-bonacci lenses in ultrasound focusing applications.

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On the use of phase correction rings on Fresnel zone plates with ultrasound piston emitters

Cited by 13 publications

References 16 publications

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses

M-Bonacci Zone Plates for Ultrasound Focusing

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