Title :
Design of acoustic beam aperture modifier using gradient-index phononic crystals
Author :
Lin, Sz-Chin S. ; Tittmann, Bernhard R. ; Huang, Tony J.
Author_Institution :
Dept. of Eng. Sci. & Mech., Pennsylvania State Univ., University Park, PA, USA
Abstract :
This paper reports the design of a novel acoustic beam aperture modifier using gradient-index phononic crystals consisting of different solid cylinders embedded in a homogeneous epoxy background. Dispersion curves of the acoustic waves were calculated using a plane-wave expansion (PWE) method and their propagation in the proposed structure was simulated by a finite-element time-domain (FDTD) method. Computational experiments elucidate the effectiveness of the acoustic beam aperture modifier.
Keywords :
II-VI semiconductors; acoustic dispersion; acoustic wave propagation; acoustic waves; acousto-optical devices; acousto-optical effects; brass; cadmium; cast iron; chromium; finite element analysis; gradient index optics; molybdenum; niobium; phononic crystals; refractive index; resins; time-domain analysis; titanium compounds; wide band gap semiconductors; zinc; zinc compounds; Cd-Cd; Cr-ZnO; Mo-TiC; Nb-Cr; TiC-Nb; Zn-ZnO; ZnO-ZnO; acoustic beam aperture modifier; acoustic waves; acoustooptical effects; dispersion curves; finite-element time-domain method; gradient-index phononic crystals; homogeneous epoxy background; plane-wave expansion method; refractive index; solid cylinders; Acoustic beams; Acoustic waves; Apertures; Finite difference methods; Materials; Time domain analysis; beam aperture modifier; gradient-index; phononic crystals;
Conference_Titel :
Ultrasonics Symposium (IUS), 2010 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4577-0382-9
DOI :
10.1109/ULTSYM.2010.5935876
