Results 21 to 30 of about 88,929 (292)
Broadband Characterization of Near-Field Focusing With Groove-Structured Lens
IEEE Access, 2021 Subdiffraction focusing of acoustic waves in the near-field can remarkably improve the signal-to-noise ratio in super-resolution acoustic imaging. Recently, we have successfully demonstrated the feasibility of near-field focusing with groove-structured ...
Ye Han, Jian Chen, Zheng Fan
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Research, 2019 We demonstrate a conformally mapped multifunctional acoustic metamaterial Mikaelian lens. Mikaelian lens is a gradient medium with a hyperbolic secant refractive index profile that can realize functions like beam self-focusing.
He Gao +6 more
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Crystals, 2022 The design theory for electromagnetic metamaterials with negative refractive indices by using a distributed transmission-line model is introduced to the design of acoustic metamaterials, and a negative refractive index (NRI) acoustic lens is designed ...
Ibuki Takegami +3 more
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Acoustic waveguide based on cascaded Luneburg lens [PDF]
JASA Express Letters, 2022 This paper investigates the acoustic Luneburg Lens (ALL) as a design framework for guiding acoustic wave propagation. In this study, an acoustic waveguide is proposed based on the characteristics of both acoustic wave focusing and collimation of cascaded
Liuxian Zhao, Timothy Horiuchi, Miao Yu
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Transient Analysis of Fresnel Zone Plates for Ultrasound Focusing Applications
Sensors, 2020 Fresnel Zone Plates are planar lenses that can be used to focus ultrasound beams. This kind of acoustic lenses can play a key role in the resolution of ultrasonic NDT systems.
Sergio Pérez-López +4 more
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Optical and acoustic super-resolution imaging in a Stampfli-type photonic quasi-crystal flat lens
Results in Physics, 2021 Super-resolution imaging has been separately realized with two-dimensional photonic and phononic quasi-crystal flat lenses for the past few decades, but they are still utilized for independent disciplines.
Hexiang Zhao, Jianlan Xie, Jianjun Liu
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Surface Acoustic Waves in Thin Films Nanometrology [PDF]
, 2015 Thin films nanometrology is an emerging field in nanoscience as the synthesis, processing and applications of nanostructured thin films require an in-depth knowledge of their elastic constants. The elastic energy of a surface acoustic wave propagating in
BETTUCCI, Andrea
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Numerical study of acoustic focusing using a bianisotropic acoustic lens [PDF]
The Journal of the Acoustical Society of America, 2020 Materials with sub-wavelength asymmetry and long-range order have recently been shown to demonstrate acoustical properties analogous to electromagnetic bianisotropy. One characteristic of bianisotropic acoustic media is the existence of direction-dependent acoustic impedance. Therefore, the magnitude and phase of the acoustic fields transmitted through
A J, Lawrence +3 more
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Design of Fresnel Lens-Type Multi-Trapping Acoustic Tweezers
Sensors, 2016 In this paper, acoustic tweezers which use beam forming performed by a Fresnel zone plate are proposed. The performance has been demonstrated by finite element analysis, including the acoustic intensity, acoustic pressure, acoustic potential energy ...
You-Lin Tu +2 more
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Negative refraction imaging of acoustic metamaterial lens in the supersonic range
AIP Advances, 2014 Acoustic metamaterials with negative refraction index is the most promising method to overcome the diffraction limit of acoustic imaging to achieve ultrahigh resolution.
Jianning Han +3 more
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