Broadband aperiodic air coupled ultrasonic lens

被引：8

作者：

Welter, John T. ^{[1
]}

Sathish, Shamachary ^{[2
]}

Dierken, Josiah M. ^{[3
]}

Brodrick, Philip G. ^{[4
]}

Cherry, Matthew R. ^{[2
]}

Heebl, Jason D. ^{[5
]}

机构：

[1] USAF, Res Lab, Nondestruct Evaluat Branch AFRL RXLP, Wright Patterson AFB, OH 45433 USA

[2] Univ Dayton, Res Inst, Struct Integr Div, Dayton, OH 45469 USA

[3] SW Ohio Council Higher Educ, Kettering, OH 45429 USA

[4] SW Ohio Council Higher Educ, Cincinnati, OH 45242 USA

[5] USAF, Space & Missile Command, AFSPC SNE, Los Angeles AFB, CA 90245 USA

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 21期

关键词：

METAMATERIALS;

D O I：

10.1063/1.4720149

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

This paper demonstrates the possibility of subwavelength, defined as less than the incident wavelength, broadband focusing in an aperiodic air coupled ultrasonic lens. A near field probe is used to detect well defined resonances from 75 to 125 kHz. The spatial resolution at each of the resonant frequencies is determined and demonstrated to be smaller than the wavelength of the ultrasonic waves. The strongest resonance is observed at 82.9 kHz with a focal spot size of 3.12 mm. The subwavelength spatial resolution of the lens structures at the resonances is attributed to the near field scattering of the acoustic waves. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4720149]

引用

页数：3

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