Plasmonic-type acoustic cloak made of a bilaminate shell

Alternating isotropic layers have been widely used in the design of acoustic cloaks to achieve the necessary anisotropy required by coordinate-transformation techniques. In this paper, this concept is expanded to plasmonic-type acoustic cloaking using a bilaminate shell consisting of two isotropic layers with uniform thickness. Explicit analytic expressions based on thin-shell approximations for the necessary cloaking layer properties are developed, facilitating an examination of the fundamental physical behavior and dominant design parameters for a bilaminate plasmonic-type acoustic cloak. Based on this analysis, the performance of a bilaminate plasmonic-type acoustic cloak is examined, and practical means of achieving the desired cloaking layer properties are discussed.