Open AccessTungsten-based highly selective solar absorber using simple nanodisk array
Author(s) -
Xu Han,
Kebo He,
Zhubing He,
Zhaoyu Zhang
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.0a1072
Subject(s) - selective surface , materials science , optics , absorptance , metamaterial , tungsten , optoelectronics , thermal , polarization (electrochemistry) , solar energy , fabrication , wavelength , reflectivity , physics , medicine , ecology , chemistry , alternative medicine , pathology , meteorology , metallurgy , biology
In this paper, we report the design, fabrication, and characterization of a tungsten-based metamaterial selective solar absorber (SSA) combining a metal-insulator-metal (MIM) structure and simple nanodisk array. The as-fabricated absorber absorbs strongly and selectively in the wavelength range of 0.5-1.75 μm with a characterized absorptance of more than 90%, which drops abruptly to less than 12.6% beyond 2.5 μm. In addition, this broadband and highly selective absorber is polarization-insensitive under incidence of normal plane waves. Moreover, the solar selectivity remains invariable up to 40°, which is beneficial for solar thermal applications. These properties are verified theoretically and experimentally in the present work. Further analysis on energy dissipation reveals the underlying physics and optical performances.