Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1103/PhysRevApplied.8.024013

Аннотация: 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. © 2017 American Physical Society.

Журнал: Physical Review Applied

Выпуск журнала: Vol. 8, Is. 2

Номера страниц: 24013

ISSN журнала: 23317019

Издатель: American Physical Society

• Lopes J.H. (Grupo de Física da Matéria Condensada, Núcleo de Ciências Exatas, Universidade Federal de Alagoas, Arapiraca, Alagoas, Brazil)
• Andrade M.A.B. (Institute of Physics, University of São Paulo, São Paulo, São Paulo, Brazil)
• Leão-Neto J.P. (Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas, Maceió, Alagoas, Brazil)
• Adamowski J.C. (Department of Mechatronics and Mechanical Systems Engineering, University of São Paulo, São Paulo, São Paulo, Brazil)
• Minin I.V. (Siberian State University of Geosystem and Technologies, Novosibirsk, Russian Federation)
• Silva G.T. (Physical Acoustics Group, Instituto de Física, Universidade Federal de Alagoas, Maceió, Alagoas, Brazil)

• Scopus