Results 31 to 40 of about 15,272 (279)
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source
Effects of Non-Elevation-Focalized Linear Array Transducer on Ultrasound Plane-Wave Imaging
Sensors, 2016 Plane-wave ultrasound imaging (PWUS) has become an important method of ultrasound imaging in recent years as its frame rate has exceeded 10,000 frames per second, allowing ultrasound to be used for two-dimensional shear wave detection and functional ...
Congzhi Wang +4 more
doaj +1 more source
Binary acoustic metasurfaces for dynamic focusing of transcranial ultrasound
Frontiers in Neuroscience, 2022 Transcranial focused ultrasound (tFUS) is a promising technique for non-invasive and spatially targeted neuromodulation and treatment of brain diseases.
Zhongtao Hu +5 more
doaj +1 more source
Frequency response of an underwater acoustic focusing composite lens
, 2021 Acoustic lenses composed of metamaterials are used as highly anisotropic subwavelength media and have broad applications in a wide range of industrial areas.
Zhao, Wei +5 more
core +1 more source
Ultrahigh Frequency Ultrasonic Transducers (150MHz) Based on Silicon Lenses
Micromachines, 2023 Acoustic microscopes and acoustic tweezers have great value in the application of microparticle manipulation, biomedical research and non-destructive testing.
Jun Chen +6 more
doaj +1 more source
Bifunctional acoustic metamaterial lens designed with coordinate transformation
, 2018 We propose a method to design bifunctional acoustic lens using acoustic metamaterials that possess separate functions at different directions. The proposed bifunctional acoustic lens can be implemented in practice with subwavelength unit cells exhibiting
Fang, Xuanlai +9 more
core +2 more sources
Quasi-flat high-index acoustic lens for 3D underwater ultrasound focusing [PDF]
, 2022 We report a quasi-flat and sub-wavelength acoustic lens built using a soft matter process for broadband ultrasonic 3D focusing in water. By using a simple emulsion templating method, a soft porous material with a high acoustic index relative to water (∼5)
BRUNET, Thomas +9 more
core +1 more source