Linear chain of weakly coupled defects in a three-dimensional phononic crystal: A model acoustic waveguide

Citation:

Sainidou R, Stefanou N, Modinos A. Linear chain of weakly coupled defects in a three-dimensional phononic crystal: A model acoustic waveguide. Physical Review B. 2006;74(17):172302 (4 pages).

Abstract:

We discuss acoustic waveguiding through weakly coupled defects along a line in a three-dimensional phononic crystal which possesses an absolute frequency gap. A chain of appropriately chosen defect cells induces modes of the elastic field over a narrow band of frequencies within the gap. We introduce a model of this band in the manner of a tight-binding description of defect bands in semiconductors and demonstrate the applicability of this model through a specific example of phononic crystal: a bubbly liquid. This allows an exact, practically analytic solution and a deeper physical insight into the processes involved.