Focusing Acoustic Beams with a Ball-Shaped Lens beyond the Diffraction Limit / J. N. Lopes [et al.]
Уровень набора: Physical Review Applied = 1958-Язык: английский.Страна: .Резюме или реферат: 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..Примечания о наличии в документе библиографии/указателя: [References: 26 tit.].Аудитория: .Тематика: электронный ресурс | труды учёных ТПУ | акустические поля | линзы | дифракция Ресурсы он-лайн:Щелкните здесь для доступа в онлайнTitle screen
[References: 26 tit.]
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.
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