Application of Axicon Lenses in Ultrasonic Techniques

Katchadjian, P.; Desimone, Carlos; Garcia, A.; Thompson, Donald O.; Chimenti, Dale E.

doi:10.1063/1.3362147

Cited by 12 publications

(16 citation statements)

References 1 publication

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“…The design is based on the R. V. Murphy's work for acrylic plastic and oil axicon [15]. A guideline for axicon lens design for the same combination of materials is described elsewhere [16]. The cavity is filled with oil and the ultrasonic lens is formed by the liquid/plastic interfaces.…”

Section: Tfus-axicon Transducer Designmentioning

confidence: 99%

A polydimethylsiloxane-based axicon lens for focused ultrasonic brain stimulation techniques

Acquaticci

Guarracino

Gwirc

et al. 2019

Acoust. Sci. & Tech.

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In this work, we built ultrasonic disc-shaped transducer for targeted neuromodulation with the addition of a solid axicon lens based on a polydimethylsiloxane (PDMS) interface. We made a numerical and experimental characterization of its acoustic field. The motor cortex of CF-1 mice was stimulated, through the skin and skull into the intact brain, with low-intensity pulsed ultrasound. Evoked muscle responses in different body segments were clearly observed, including hindlimb, forelimb, and tail. Axicon lens affixed on the face of the transducer makes possible a targeted modulation of the motor cortex by pulsed ultrasound, inducing muscle contraction in a specific body segment. In this approach, the lateral and axial spatial resolution is comparable to spherical segment ultrasound transducers, but with a shorter focal length. Thus, ultrasound axicon looks attractive to investigate the functional contributions of fine-grained spatial structures in the brain.

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Section: Tfus-axicon Transducer Designmentioning

confidence: 99%

A polydimethylsiloxane-based axicon lens for focused ultrasonic brain stimulation techniques

Acquaticci

Guarracino

Gwirc

et al. 2019

Acoust. Sci. & Tech.

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“…However, they are not as broadly applied in acoustics as in optics, which is perhaps related to the lack of convenient formation techniques of such a kind of acoustic wave. Acoustic Bessel beams have been excited using acoustical axicons [36], in analogy to the optical case. In any case, the most convenient way to form acoustic Bessel beams is by using annular transducer arrays [37,38].…”

Section: Introductionmentioning

confidence: 99%

Design of Acoustical Bessel-Like Beam Formation by a Pupil Masked Soret Zone Plate Lens

Tarrazó-Serrano

Castiñeira-Ibáñez

Minin

et al. 2019

Sensors

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The image performance of acoustic and ultrasound sensors depends on several fundamental parameters such as depth of focus or lateral resolution. There are currently two different types of acoustic diffractive lenses: those that form a diffraction-limited spot with a shallow depth of focus (zone plates) and lenses that form an extended focus (quasi-Bessel beams). In this paper, we investigate a pupil-masked Soret zone plate, which allows the tunability of a normalized angular spectrum. It is shown that the depth of focus and the lateral resolution can be modified, without changing the lens structure, by choosing the size of the pupil mask. This effect is based on the transformation of spherically-converging waves into quasi-conical waves, due to the apodization of the central part of the zone plate. The theoretical analysis is verified with both numerical simulations and experimental measurements. A Soret zone plate immersed in water with D/2F = 2.5 and F = 4.5λ changes its depth of focus from 2.84λ to 5.9λ and the lateral resolution increases from 0.81λ to 0.64λ at a frequency of 250 kHz, by modifying the pupil mask dimensions of the Soret zone plate.

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“…However, they are not as broadly applied as in optics, which is perhaps related to the lack of convenient techniques of formation of such kind of acoustic waves. Acoustic Bessel beams have been excited using acoustical axicons [39], in analogy to the optical case. In any case, the most convenient way to form acoustic Bessel beams is by using annular transducer arrays [40,41].…”

Section: Introductionmentioning

confidence: 99%

Design of Acoustical Bessel-Like Beam Formation by Tunable Angular Spectrum in Soret Zone Plate Lens

Tarrazó-Serrano¹,

Castiñeira-Ibáñez²,

Minin³

et al. 2018

Preprint

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The image performance of acoustic and ultrasound sensors depends on several fundamental parameters such as depth of focus or spatial resolution. There are currently two different type of acoustic diffractive lenses: those which form a diffraction-limited spot with a shallow depth of focus (zone plates) and lenses which form an extended focus (quasi-Bessel beams). In this paper, we investigate a pupil-masked Soret zone plate which allows the tunability of a normalized angular spectrum. It is shown that the depth of focus and the spatial resolution can be modified, without changing the lens structure, by choosing the size of the amplitude pupil mask. This effect is based on the transformation of spherically converging waves into quasi-conical waves, due to the apodization of the central part of the zone plate. The theoretical analysis is verified with both numerical simulations and experimental measurements. A Soret zone plate immersed in water with D/2F=2.5 and F=4.5$\lambda$, changes its depth of focus from 2.84$\lambda$ to 5.9$\lambda$ and the spatial resolution increases from 0.81$\lambda$ to 0.64$\lambda$ at a frequency of 250 kHz, by modifying the pupil mask dimensions of the Soret zone plate.

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Application of Axicon Lenses in Ultrasonic Techniques

Cited by 12 publications

References 1 publication

A polydimethylsiloxane-based axicon lens for focused ultrasonic brain stimulation techniques

A polydimethylsiloxane-based axicon lens for focused ultrasonic brain stimulation techniques

Design of Acoustical Bessel-Like Beam Formation by a Pupil Masked Soret Zone Plate Lens

Design of Acoustical Bessel-Like Beam Formation by Tunable Angular Spectrum in Soret Zone Plate Lens

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