title: Imaging performance of finite uniaxial metamaterials with large anisotropy.
abstract: Metamaterials with extreme anisotropy overcome the diffraction limit by supporting the propagation of otherwise evanescent waves. Recent experiments in slabs of wire media have shown that images deteriorate away from the longitudinal Fabry-Perot resonances of the slab. Existing theoretical models explain this using nonlocality, surface waves, and additional boundary conditions. We show that image aberrations can be understood as originating from cavity resonances of uniaxial media with large local axial permittivity. We apply a simple cavity resonator model and a transfer matrix approach to replicate salient experimental features of wire media hyperlenses. These results offer avenues to reduce observed imaging artefacts, and are applicable to all uniaxial media with large magnitude of the axial permittivity, e.g., wire media and layered media.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Tuniz
authors.forename: Damian
authors.initials: D
authors.lastname: Ireland
authors.forename: Leon
authors.initials: L
authors.lastname: Poladian
authors.forename: Alexander
authors.initials: A
authors.lastname: Argyros
authors.forename: C
authors.initials: C
authors.lastname: Martijn de Sterke
authors.forename: Boris T
authors.initials: BT
authors.lastname: Kuhlmey