title: Design of highly absorbing metamaterials for infrared frequencies.
abstract: Simple designs for polarization independent, metamaterial absorbers at mid-infrared wavelengths and over wide angle of incidence are evaluated computationally. One design consists of an array of circular metallic disks separated from a continuous metallic film by a dielectric film, and shows over 99.9% peak absorbance and a resonant bandwidth of about 0.2 μm wavelengths. The effects of various geometric parameters are analyzed for this metamaterial. Another design consisting of an array of stacked metal-dielectric-metal disks is shown to have an absorbance of over 90% in a comparatively large band of over 1 μm bandwidth, although with a lower peak absorbance of 97%.
authors.affiliation: Department of Physics, Indian Institute of Technology, Kanpur Kanpur, India 208016. dayal@iitk.ac.in
authors.forename: Govind
authors.initials: G
authors.lastname: Dayal
authors.forename: S Anantha
authors.initials: SA
authors.lastname: Ramakrishna