Issue |
EPL
Volume 106, Number 2, April 2014
|
|
---|---|---|
Article Number | 24005 | |
Number of page(s) | 5 | |
Section | Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics | |
DOI | https://doi.org/10.1209/0295-5075/106/24005 | |
Published online | 30 April 2014 |
Acoustic Bessel-like beam formation by an axisymmetric grating
1 Instituto de Investigación para la Gestión Integrada de Zonas Costeras, Universitat Politècnica de València Paranimf 1, E-46730 Grao de Gandia, Spain
2 LUNAM Université, Université du Maine, CNRS, LAUM UMR 6613 - Av. O. Messiaen, F-72085 Le Mans, France
3 IUMPA, Universitat Politècnica de València - Camí de Vera s/n, E-46022 Valencia, Spain
4 Centro de Tecnologías Físicas: Acústica, Materiales y Astrofísica, Universitat Politècnica de València Camí de Vera s/n, E-46022 Valencia, Spain
5 ICREA, Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya Colom, 11, E-08222 Terrassa, Barcelona, Spain
Received: 4 February 2014
Accepted: 7 April 2014
We report Bessel-like beam formation of acoustic waves by means of an axisymmetric grating of rigid tori. The results show that the generated beam pattern is similar to that of Bessel beams, characterized by elongated non-diffracting focal spots. A multiple foci structure is observed, due to the finite size of the lens. The dependence of the focal distance on the frequency is also discussed, on the basis of an extended grating theory. Experimental validation of acoustic Bessel-like beam formation is also reported for sound waves. The results can be generalized to wave beams of different nature, as optical or matter waves.
PACS: 43.20.+g – General linear acoustics / 43.20.Fn – Scattering of acoustic waves / 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound
© EPLA, 2014
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