A metamaterial absorber for the terahertz regime: Design, fabrication and characterization

Details A metamaterial absorber for the terahertz regime: Design, fabrication and characterization A metamaterial absorber for the terahertz regime: Design, fabrication and characterization

2008-03-11

arxiv.org/abs/0803.1646v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1364/OE.16.007181

We present a metamaterial that acts as a strongly resonant absorber at terahertz frequencies. Our design consists of a bilayer unit cell which allows for maximization of the absorption through independent tuning of the electrical permittivity and magnetic permeability. An experimental absorptivity of 70% at 1.3 terahertz is demonstrated. We utilize only a single unit cell in the propagation direction, thus achieving an absorption coefficient $\alpha$ = 2000 cm$^{-1}$. These metamaterials are promising candidates as absorbing elements for thermally based THz imaging, due to their relatively low volume, low density, and narrow band response.

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