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Polarization insensitive terahertz metamaterial absorber

2011; Optica Publishing Group; Volume: 36; Issue: 8 Linguagem: Inglês

10.1364/ol.36.001524

1539-4794

James Grant, Yong Ma, Subhajit Saha, Lai Bun Lok, Ata Khalid, David R. S. Cumming,

Plasmonic and Surface Plasmon Research

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.