Abstract
We demonstrate experimentally for the first time the acoustojet (acoustic jets) formed from acoustic plane wave scattering by a penetrable cylindrical particle with dimensions of several wavelengths. It acts as a superlens with subwavelength localization of acoustical wave. During the scattering by elastic solid particles, additional internal shear waves are excited due to modes conversion. This mechanism allows achieving sharp focusing in the near-field zone. Such mesoscale single particle cylindrical lens may be considered as acoustic metamaterials free superlenses with resolution beyond the diffraction limit.
Highlights
Acoustic lenses find applications in various areas ranging from nondestructive detection to biomedical imaging and even noninvasive cancer treatment
Similar to optics [16, 31], the analysis of acoustojet is characterized by such main parameters of ultrasound beams as peak intensity, its position along Z axis, full width at half maximum (FWHM), full length at half maximum (FLHM) at -3 dB [22, 32]
We have demonstrated for the first time that acoustojets formed by acoustic plane wave scattered by penetrable cylindrical particle lens with the diameter of four wavelengths may be used for subwavelength localization of acoustical waves
Summary
Acoustic lenses find applications in various areas ranging from nondestructive detection to biomedical imaging and even noninvasive cancer treatment. In the linear mode it should be expected that methods of sub-wave focusing, based on photonic jet phenomenon, can be successfully applied to the acoustic range as well This can be observed on the analogy between the wave equations, specifying acoustic and electromagnetic scattering processes [17]. PNJ effect have motivated us to propose the concept of acoustic jets, called “acoustojets” [18, 19] It has been theoretically predicted for the first time [18, 19] that the existence of acoustic analogue of PNJ phenomenon is possible, providing an opportunity for subwavelength localization of acoustic field in shadow area of arbitrary 3D penetrable mesoscale particle. The phenomenon of acoustojet formation was experimentally verified for spherical Rexolite particle, immersed in water [22]
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