Focusing Acoustic Beams with a Ball-Shaped Lens beyond the Diffraction Limit; Physical Review Applied; Vol. 8, iss. 2

Focusing Acoustic Beams with a Ball-Shaped Lens beyond the Diffraction Limit; Physical Review Applied; Vol. 8, iss. 2

التفاصيل البيبلوغرافية
Parent link:Physical Review Applied.— , 1958-
Vol. 8, iss. 2.— 2017.— [024013, 7 p.]
مؤلف مشترك: Томский политехнический университет
مؤلفون آخرون: Lopes J. N., Andrade M. A. B., Leao-Neto J. P., Adamowski J. C., Minin I. V. Igor Vladilenovich, Silva G. T.
الملخص: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
اللغة:الإنجليزية
منشور في: 2017
الموضوعات:
электронный ресурс
труды учёных ТПУ
акустические поля
линзы
дифракция
الوصول للمادة أونلاين:https://doi.org/10.1103/PhysRevApplied.8.024013
التنسيق: الكتروني فصل الكتاب
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=656486

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