title: A single-phase elastic hyperbolic metamaterial with anisotropic mass density.
abstract: Wave propagation can be manipulated at a deep subwavelength scale through the locally resonant metamaterial that possesses unusual effective material properties. Hyperlens due to metamaterial's anomalous anisotropy can lead to superior-resolution imaging. In this paper, a single-phase elastic metamaterial with strongly anisotropic effective mass density has been designed. The proposed metamaterial utilizes the independently adjustable locally resonant motions of the subwavelength-scale microstructures along the two principal directions. High anisotropy in the effective mass densities obtained by the numerical-based effective medium theory can be found and even have opposite signs. For practical applications, shunted piezoelectric elements are introduced into the microstructure to tailor the effective mass density in a broad frequency range. Finally, to validate the design, an elastic hyperlens made of the single-phase hyperbolic metamaterial is proposed with subwavelength longitudinal wave imaging illustrated numerically. The proposed single-phase hyperbolic metamaterial has many promising applications for high resolution damage imaging in nondestructive evaluation and structural health monitoring.
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: R
authors.initials: R
authors.lastname: Zhu
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: Y Y
authors.initials: YY
authors.lastname: Chen
authors.affiliation: Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing, People's Republic of China.
authors.forename: Y S
authors.initials: YS
authors.lastname: Wang
authors.affiliation: School of Aerospace Engineering, Beijing Institute of Technology, Beijing, People's Republic of China.
authors.forename: G K
authors.initials: GK
authors.lastname: Hu
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: G L
authors.initials: GL
authors.lastname: Huang