Wavelength-scale gas-filled cuboid acoustic lens with diffraction limited focusing

Tarrazó-Serrano, Daniel; Minin, Igor V.; Rubio, Constanza

doi:10.1016/j.rinp.2019.02.011

Cited by 13 publications

(5 citation statements)

References 18 publications

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“…Also, a core-shell lens, with the outer layer made of a thermoplastic polymer and filled with ethanol, superfocused an ultrasound beam in water to a 0.85λ spot [21]. Others arrangements using lenses with different geometries such as cylindrical, cuboid and Fresnel shapes yield a resolution even smaller than λ/2 [22]- [31]. Ultrasonic images have successfully generated with the lens-based superresolution system [32]- [33].…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of a superresolution ultrasonic transducer

Leão-Neto¹,

Uliana²,

Pavan³

et al. 2021

Preprint

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Highly sensitive ultrasound probes are needed to expand the capabilities of biomedical ultrasound and industrial non-destructive testing (NDT). Pursuing better imaging quality, while keeping fabrication costs low, is an important trend in the current development of ultrasound imaging systems. In this paper, we report the development and characterization of an ultrasonic transducer that (super)focuses ultrasonic waves beyond the so-called diffraction limit, i.e., the beamwaist is roughly narrower than one wavelength. The transducer comprises an additive manufactured case with a circular flat piezoelectric actuator fixed at the bottom and a core-shell lens (with a stainless steel core and a polymer shell) placed at the probe's conical tip. The core-shell lens is responsible to superfocusing effect of ultrasonic waves. Operating at approximately 3 MHz, the transverse and axial resolution for C- and B-scan images are, respectively, 0.65λ and 3λ/2, with the wavelength being λ = 0.5 mm. Whereas the system depth-of-field is 6.3λ. To demonstrate the transducer capability to resolve subwavelength structures, we successfully obtain images of a copper wire forming a Y-intersection, whose branches a diameter similar to human hair (0.15 mm ≈ 0.3λ). Our results represent a solid step toward the development of ultrasonic superresolution transducer applied for biomedical imaging and shallow NDT of materials.

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Section: Introductionmentioning

confidence: 99%

Development and characterization of a superresolution ultrasonic transducer

Leão-Neto¹,

Uliana²,

Pavan³

et al. 2021

Preprint

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“…supported by a cuboid particle filled with CO 2 in [12]. An ABS spherical shell filled with liquids immersed in water was presented to achieve sub-wavelength AJs in [13] and sub-λ/2 AJs in [14].…”

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confidence: 99%

Reflective acoustic jet from a mesoscale concave mirror

Zhou¹,

Wang²,

Chen³

et al. 2023

EPL

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An acoustic jet (AJ) is similar to a photonic nanojet (PNJ) in achieving high-intensity and sub-wavelength scale focus. Herein, we numerically investigate a reflective acoustic jet (r-AJ) generated by a mesoscale concave mirror using finite element method. A sub-λ/2 rotational symmetric r-AJ can be produced by an air-filled polylactic acid (PLA) spherical concave mirror immersed in water under a plane acoustic wave. And the properties of r-AJ affected by the concave angle of the mirror are also presented. By combining a PLA spherical structure with the concave mirror, a sub-λ/3 near-field r-AJ can be achieved. We also present the streamlines of the time-averaged acoustic intensity vectors near the r-AJ and the influence of the structural loss of the designed PLA mirror on the r-AJs. The influences of the incident frequency change and PLA properties change on the r-AJs generation and the slight angle between the incoming field and the mirror are presented. Finally, we numerically discuss the potential application of our designed mirror in direct sound printing.

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“…A cuboid particle filled with CO 2 in Ref. 16 was presented to obtain sub-wavelength focusing AJs. In Ref.…”

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confidence: 99%

An engineered acoustic lens for a narrow acoustic jet generation

Zhou

Wang

Chen

2022

Appl. Phys. Express

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Herein, we numerically investigate novel engineered shell structures immersed in water to generate narrow acoustic jets (AJs). In our simulations, acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA), two kinds of 3D printing materials, are selected for designing acoustic lenses. The engineered cylindrical shell with a cross or a hole is presented to generate a narrow AJ. Our simulation shows that the full width at half maximum (FWHM) of the AJ can reach below λ/3. We also show that the engineered schemes are effective for the spherical lens and a rotational symmetric AJ with a FWHM of ~0.4λ is achieved.

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Wavelength-scale gas-filled cuboid acoustic lens with diffraction limited focusing

Cited by 13 publications

References 18 publications

Development and characterization of a superresolution ultrasonic transducer

Development and characterization of a superresolution ultrasonic transducer

Reflective acoustic jet from a mesoscale concave mirror

An engineered acoustic lens for a narrow acoustic jet generation

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