Wide-angle polarization independent infrared broadband absorbers based on metallic multi-sized disk arrays

Abstract

Two-dimensional metallic broadband absorbers on a SiO(2)/Ag/Si substrate were experimentally studied. The absorptivity of such structure can be increased by tailoring the ratio of disk size to the unit cell area. The metallic disk exhibits a localized surface plasmon polariton (LSPP) mode for both TE and TM polarizations. A broadband thermal emitter can be realized because the LSPP mode is independent of the periodicities. By manipulating the ratios and disk sizes, a high-performance, wide-angle, polarization-independent dual band absorber was experimentally achieved. The results demonstrated a substantial flexibility in absorber designs for applications in thermal photovoltaics, sensors, and camouflage.

Broadband absorption in mid-infrared metamaterial absorbers with multiple dielectric layers

“…However, the inherent resonant nature of metamaterials determines that the absorption bandwidth of MAs is usually narrow, which has thus restricted MAs from more extensive applications such as the energy harvesting. Efforts have been made to extend the absorption bandwidth through the concept of multiresonances [13][14][15][16][17][18]. Multiresonant broadband absorbers are generally realized by the elaborate blending of dimensionally dispersed metallic resonators either vertically [13][14][15] or horizontally [16][17][18].…”

Making a Conducting Metal with Optical Transparency via Coupled Plasmonic-Photonic Nanostructures

“…By artificially introducing a dielectric layer as the substrate for the above plasmonic metal film structure, near-unity optical transparency is achieved. Since only a simple dielectric layer and one PC are used in this platform, the proposed broadband optical transparent continuous metal film structure can be feasibly realized via the standard top-down nanotechnology together with the lithography methods [38,39]. These features hold the proposed scheme with potential applications in the sub-wavelength optoelectronic devices.…”

Ultrabroadband Mid-infrared Light Absorption Based on a Multi-cavity Plasmonic Metamaterial Array

“…In order to achieve a broad range of absorption, one direct strategy is to merge multiple absorption peaks into a wide band. Practically, we can combine several subunits laterally in one period [14][15][16][17][18][19][20]. However, the possible number of subunits, which decides the amount of resonances along with absorption bandwidth, is very finite [20].…”