Abstract
In this study, we report the characteristics of acoustic jets obtained through a mesoscale (radius less than 5 wavelengths) ABS cylinder made with a 3D printer. We have analyzed the influence of cylinder size on the characteristic parameters of an acoustic jet, such as maximum acoustic intensity at focus, Full Width at Half Maximum and length of Acoustic Jet. FWHM below 0.5 wavelength in AJ was experimentally obtained. It has been observed that there are two operating regimes depending on the cylinder radius: the resonant and the non-resonant. In the resonant regime, the excitation of Whispering Gallery Modes results in optimal parameter values of the acoustic jet. However, as it is a resonant regime, any minimal variation in cylinder size, working frequency or refractive index would make resonance disappear. In non-resonant mode, a phononic crystal has been embedded inside the cylinder and the characteristic parameters of the acoustic jet have been studied. These have been observed to improve. Finally, we have shown that curved acoustic jets can be obtained with the ABS cylinder with a phononic crystal embedded inside.
Highlights
In this study, we report the characteristics of acoustic jets obtained through a mesoscale ABS cylinder made with a 3D printer
A physical phenomenon with which subwavelength focusing is achieved is the photonic nanojet (PNJ), which consists of a narrow electromagnetic beam that emerges from the shadow surface of a dielectric microsphere or micro cylinder
We have presented an ABS cylinder made with a 3D printer that achieves AJ with a Full Width at Half Maximum (FWHM) below /2
Summary
We report the characteristics of acoustic jets obtained through a mesoscale (radius less than 5 wavelengths) ABS cylinder made with a 3D printer. In non-resonant mode, a phononic crystal has been embedded inside the cylinder and the characteristic parameters of the acoustic jet have been studied Since there is a formal analogy between electromagnetic waves and acoustic waves, the results obtained for electromagnetic waves can be transferred to acoustic waves, taking into account their intrinsic differences In this sense, the existence of an intense acoustic field located on the shadow surface of a dielectric sphere was first demonstrated in simulations by Minin and M inin[14]. The PhC is formed by water cylinders embedded in ABS This is intended to improve the key parameters in an AJ, such as intensity enhancement, FWHM and the length of AJ, among others. In order to validate these numerical predictions, some experiments have been carried out using an automated robot in a water tank, reproducing FEM simulations as far as possible
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