Journal
JOURNAL OF APPLIED PHYSICS
Volume 111, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4729803
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Funding
- High Performance Computing Group at the Pennsylvania State University
- National Institutes of Health (NIH) [1DP2OD007209-01]
- National Science Foundation
- Penn State Center for Nanoscale Science (MRSEC)
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This article reports the design concept of a novel acoustic beam aperture modifier using butt-jointed gradient-index phononic crystals (GRIN PCs) consisting of steel cylinders embedded in a homogeneous epoxy background. By gradually tuning the period of a GRIN PC, the propagating direction of acoustic waves can be continuously bent to follow a sinusoidal trajectory in the structure. The aperture of an acoustic beam can therefore be shrunk or expanded through change of the gradient refractive index profiles of the butt-jointed GRIN PCs. Our computational results elucidate the effectiveness of the proposed acoustic beam aperture modifier. Such an acoustic device can be fabricated through a simple process and will be valuable in applications, such as biomedical imaging and surgery, nondestructive evaluation, communication, and acoustic absorbers. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729803]
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