Metamaterial polarization spectral filter: isolated transmission line at any prescribed wavelength

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Description/Abstract

Spectral filters are key components of telecommunication, imaging, sensor and spectroscopic devices. Optical filters are achieved though engineering of interferences in a complex multilayered structure, or by exploiting dispersion of absorption or anisotropy in natural media. In the microwave and terahertz regions frequency selective surfaces are used to provide spectral selectivity. While being extremely good in some of their characteristics, narrow-band interference filters suffer from a small acceptance angle, filters based on absorption or anisotropy depend on the availability of natural media to provide functionality at the required wavelength and frequency selective surfaces often show multiple and wide transmission bands. Here we demonstrate that a narrow-band spectral filter with a ripples-free isolated transmission peak and wide acceptance angle can be constructed exploiting polarization properties of a metal film patterned on the subwavelength scale. Its transmission band can be engineered to be anywhere from the visible to microwaves.