Phononic crystals with planar defects
Abstract
We study the effect of planar defects in phononic crystals of spherical scatterers. It is shown that a plane of impurity spheres introduces modes of vibration of the elastic field localized on this plane at frequencies within a frequency gap of a pure phononic crystal; these show up as sharp resonances in the transmittance of elastic waves incident on a slab of the crystal. A periodic arrangement of impurity planes along a given direction creates narrow impurity bands with a width which depends on the position of these bands within the frequency gap of the pure crystal and on the separation between the impurity planes. We show how a slight deviation from periodicity (one impurity plane is different from the rest) reduces dramatically the transmittance of elastic waves incident on a slab of the crystal.
Cite
@article{arxiv.cond-mat/0005219,
title = {Phononic crystals with planar defects},
author = {I. E. Psarobas and N. Stefanou and A. Modinos},
journal= {arXiv preprint arXiv:cond-mat/0005219},
year = {2009}
}
Comments
6pages, 8 figures, submitted to Phys. Rev. B