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Focusing Acoustic Beams with a Ball-Shaped Lens beyond the Diffraction Limit

J. H. Lopes1, M. A. B. Andrade2, J. P. Leão-Neto3, J. C. Adamowski4, I. V. Minin5, and G. T. Silva3,*

  • 1Grupo de Física da Matéria Condensada, Núcleo de Ciências Exatas, Universidade Federal de Alagoas, Arapiraca, Alagoas 57309-005, Brazil
  • 2Institute of Physics, University of São Paulo, São Paulo, São Paulo 05314-970, Brazil
  • 3Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas, Maceió, Alagoas 57072-970, Brazil
  • 4Department of Mechatronics and Mechanical Systems Engineering, University of São Paulo, São Paulo, São Paulo 05508-030, Brazil
  • 5National Research Tomsk Polytechnic University, Tomsk, 30, Lenin Avenue, Russia, 634050

  • *glauber@pq.cnpq.br
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Phys. Rev. Applied 8, 024013 – Published 18 August, 2017Erratum Phys. Rev. Applied 8, 039901 (2017)

DOI: https://doi.org/10.1103/PhysRevApplied.8.024013

Abstract

We report on measurements of a subwavelength focusing of an ultrasound beam by a polymer ball-shaped lens (Rexolite) immersed in water at room temperature. The beam arises in the near field of the ball-lens shadow side. Considering a 8.2λ-diameter ball lens, with λ being the wavelength, we find a superfocused beam with 14.4-dB-intensity gain, a full width and a full length at half maximum of λ/2 and 2.2λ, respectively, and sidelobes under −10  dB. The observed phenomenon is in excellent agreement with the theoretical and computational predictions based on the partial-wave expansion and finite-element methods. Our results may foster the design of simple lens elements for super-resolution acoustic microscopy and ultrasound imaging.

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Corrections

13 September, 2017

Erratum

Publisher’s Note: Focusing Acoustic Beams with a Ball-Shaped Lens beyond the Diffraction Limit [Phys. Rev. Applied 8, 024013 (2017)]

J. H. Lopes, M. A. B. Andrade, J. P. Leão-Neto, J. C. Adamowski, I. V. Minin, and G. T. Silva
Phys. Rev. Applied 8, 039901 (2017)

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Phys. Rev. Applied 8, 024013– Published 18 August, 2017
  • Received 31 March 2017
  • Corrected 13 September 2017

© 2017 American Physical Society

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