Design of acoustic beam aperture modifier using gradient-index phononic crystals

Sz Chin Steven Lin, Bernhard R. Tittmann, Tony Jun Huang

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


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.

Original languageEnglish (US)
Article number123510
JournalJournal of Applied Physics
Issue number12
StatePublished - Jun 15 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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