Abstract
In recent years metamaterials have afforded high optical anisotropy, beyond the levels available using naturally occurring materials---but with limited spectral bandwidth. The authors have produced flexible gold ``metafoils'' of subwavelength thickness that sort circularly polarized light with very high contrast, over a broad frequency range that could be extended to include the important infrared ``fingerprint'' region used routinely for molecular spectroscopy. These metafoils can be made using established hot-embossing and nanoimprinting processes for cost-effective mass manufacture.
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