title: Polarization insensitive terahertz metamaterial absorber.
abstract: We present the simulation, implementation, and measurement of a polarization insensitive resonant metamaterial absorber in the terahertz region. The device consists of a metal/dielectric-spacer/metal structure allowing us to maximize absorption by varying the dielectric material and thickness and, hence, the effective electrical permittivity and magnetic permeability. Experimental absorption of 77% and 65% at 2.12 THz (in the operating frequency range of terahertz quantum cascade lasers) is observed for a spacer of polyimide or silicon dioxide respectively. These metamaterials are promising candidates as absorbing elements for thermally based terahertz imaging.
authors.affiliation: School of Electronics, University of Glasgow, Glasgow, G12 8LT, UK.
authors.forename: J
authors.initials: J
authors.lastname: Grant
authors.forename: Y
authors.initials: Y
authors.lastname: Ma
authors.forename: S
authors.initials: S
authors.lastname: Saha
authors.forename: L B
authors.initials: LB
authors.lastname: Lok
authors.forename: A
authors.initials: A
authors.lastname: Khalid
authors.forename: D R S
authors.initials: DR
authors.lastname: Cumming