Octave omnidirectional band gap in a three-dimensional phononic crystal

Author

Khelif, Abdelkrim ; Hsiao, Fu-Li ; Choujaa, Abdelkrim ; Benchabane, Sarah ; Laude, Vincent

Author_Institution

Franche-Comte Electron., Mec., Thermique et Opt., Centre Nat. de la Rech. Sci.-Micro Nano Sci. & Syst., Besancon, France

Volume

57

Issue

7

fYear

2010

fDate

7/1/2010 12:00:00 AM

Firstpage

1621

Lastpage

1625

Abstract

We report on the experimental observation of a one-octave-large omnidirectional elastic band gap for longitudinal waves in a three-dimensional phononic crystal consisting of face-centered-cubic arrays of close-packed steel beads in a solid epoxy matrix. The 60% relative width of the band gap is larger than expected based on the contrast in material properties, and is confirmed by band structure diagram and transmission spectra computations. The coupling between shear and longitudinal polarizations is pointed out as a mechanism for enlarging the band gap by comparing with the steel beads in water matrix case.

Keywords

elastic waves; energy gap; phononic crystals; 3D phononic crystal; band gap; band structure diagram; close-packed steel beads; coupling; face-centered-cubic arrays; longitudinal polarization; longitudinal waves; one-octave-large omnidirectional elastic band gap; relative width; shear polarization; solid epoxy matrix; steel beads; transmission spectra computation; Couplings; Material properties; Photonic band gap; Polarization; Solids; Steel;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/TUFFC.2010.1592

Filename

5507664