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Opt Lett. 2011 Apr 15;36(8):1524-6. doi: 10.1364/OL.36.001524.

Polarization insensitive terahertz metamaterial absorber.

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  • 1School of Electronics, University of Glasgow, Glasgow, G12 8LT, UK.


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.

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