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We report ultrabroadband, easily tunable, and highly efficient metamaterial-based terahertz wave retarders that are able to convert linear polarization into elliptical and circular polarization states. The functional device consists of a metamaterial microstructure and a grating coupler patterned on each side of fused silica substrates. The dielectric response of the metamaterial microstructure and...
We report ultra-broadband, easily tuned, and highly efficient metamaterial terahertz wave retarders that are able to convert linear polarization into circular and elliptical polarization states. The broadband nature arises from the combination of the plasmonic effect and the property of polarization conversion. The dielectric response of the metamaterial microstructure and the angular phase dispersion...
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