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Sci Rep. 2016 Feb 1;6:20347. doi: 10.1038/srep20347.

Metasurface Broadband Solar Absorber.

Author information

1
Center for Integrated Nanotechnologies, Los Alamos National Laboratory, MS K771, Los Alamos, New Mexico 87545, USA.
2
Theoretical Division, Los Alamos National Laboratory, MS B213, Los Alamos, New Mexico 87545, USA.
3
Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
4
Chemistry Division, Los Alamos National Laboratory, MS K558, Los Alamos, New Mexico 87545, USA.
5
Intelligence and Space Research Division, Los Alamos National Laboratory, MS B244, Los Alamos, New Mexico 87545, USA.
6
Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87123, USA.

Abstract

We demonstrate a broadband, polarization independent, wide-angle absorber based on a metallic metasurface architecture, which accomplishes greater than 90% absorptance in the visible and near-infrared range of the solar spectrum, and exhibits low absorptivity (emissivity) at mid- and far-infrared wavelengths. The complex unit cell of the metasurface solar absorber consists of eight pairs of gold nano-resonators that are separated from a gold ground plane by a thin silicon dioxide spacer. Our experimental measurements reveal high-performance absorption over a wide range of incidence angles for both s- and p-polarizations. We also investigate numerically the frequency-dependent field and current distributions to elucidate how the absorption occurs within the metasurface structure.

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