Focusing Acoustic Beams with a Ball-Shaped Lens beyond the Diffraction Limit
| Parent link: | Physical Review Applied.— , 1958- Vol. 8, iss. 2.— 2017.— [024013, 7 p.] |
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| Corporate Author: | |
| Other Authors: | , , , , , |
| Summary: | Title screen 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/2and 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. Режим доступа: по договору с организацией-держателем ресурса |
| Published: |
2017
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| Subjects: | |
| Online Access: | https://doi.org/10.1103/PhysRevApplied.8.024013 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=656486 |