Abstract: A broadband hyperbolic metamaterial absorber is provided that includes a substrate layer, a plurality of N-doped silicon layers, a plurality of silicon layers, and a silicon grating layer, where the silicon grating layer includes a pattern of through-holes, where the through-holes have a diameter d, a height h, and a periodic separation distance a, where the plurality of N-doped silicon layers and the plurality of silicon layers are arranged in a stack of alternating layers of N-doped silicon layers and silicon layers disposed on the substrate layer, where the silicon grating layer is disposed on the stack of alternating layers of N-doped silicon layers and silicon layers.

Abstract: A broadband hyperbolic metamaterial absorber is provided that includes a substrate layer, a plurality of N-doped silicon layers, a plurality of silicon layers, and a silicon grating layer, where the silicon grating layer includes a pattern of through-holes, where the through-holes have a diameter d, a height h, and a periodic separation distance a, where the plurality of N-doped silicon layers and the plurality of silicon layers are arranged in a stack of alternating layers of N-doped silicon layers and silicon layers disposed on the substrate layer, where the silicon grating layer is disposed on the stack of alternating layers of N-doped silicon layers and silicon layers.

Abstract: An absorber for energy harvesting is provided comprising a structure of a multilayered N-doped Si/Si hyperbolic metamaterial (HMM) integrated with a sub-hole Si grating, wherein the structure has a tunable absorption peak tunable from 4.5 ?m to 11 ?m through changing the grating parameters.