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Wide-angle infrared absorber based on a negative-index plasmonic metamaterial
A metamaterial-based approach in making a wide-angle absorber of infrared radiation is described. The technique is based on an anisotropic perfectly impedance-matched negative-index material (PIMNIM). It is shown analytically that a PIMNIM that is subwavelength in all three dimensions enables absorption close to 100% for incidence angles up to $45\ifmmode^\circ\else\textdegree\fi{}$ …