Rotating acoustic drills by the interference of detuned vortices
| Autor: | Noe Jimenez, Enrique Gonzalez-Mateo, Francisco Camarena, Kestitis Staliunas |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Intensity distribution
Direction frequencies Tweezers Bessel beams Acoustic fields Gaussian beams Sound beams Dynamic intensity Bessel Funcions de Bessel beam Física [Àrees temàtiques de la UPC] Vortex flow Infill drilling Holograms Mechanical 3D printers Detuned Bessel functions Angular frequencies Beam axis Feixos de làser Tweezer Drills Angular distribution Vortex Medical applications Laser beams |
| Popis: | We present acoustic drill beams, structured sound beams exhibiting a dynamic intensity distribution that matches the shape of a helix. The intensity distribution rotates along the beam axis with controlled direction and angular frequency, resembling in this way the shape of a mechanical drill bit. Acoustic drill beams emerge as the spatiotemporal interference of two confocal, detuned vortex beams. The beam parameters are fully tuneable. The detuned frequency, the detuned wavenumber and the detuned topological charge of the composing beams can be tuned to control the drill parameters such as the number of drill arms, the winding period, the rotational speed, and their direction. We show that elongated drill beams are obtained using two confocal high-order Bessel beams, allowing analytical solutions for optimal overlap. In addition, drill beams can also be synthesised using focused ultrasound vortices. Analytical, numerical, and experimental results are shown in the ultrasound regime using a low-cost device based on two 1-MHz confocal piezoelectric transducers and 3D printed acoustic holograms. This exotic structured wavefront opens new avenues for wave-matter interaction, such as contactless particle manipulation, matter processing or biomedical applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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