Han Xu, He Kebo, He Zhubing, Zhang Zhaoyu
Opt Express. 2017 Nov 27;25(24):A1072-A1078. doi: 10.1364/OE.25.0A1072.
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.
在本文中，我们报道了一种结合金属-绝缘体-金属（MIM）结构和简单纳米盘阵列的钨基超材料选择性太阳能吸收器（SSA）的设计、制造和表征。所制备的吸收器在0.5-1.75μm波长范围内具有强烈且选择性的吸收，其特征吸收率超过90%，在2.5μm以上则急剧下降至小于12.6%。此外，这种宽带且高选择性的吸收器在垂直平面波入射下对偏振不敏感。而且，太阳能选择性在高达40°时保持不变，这有利于太阳能热应用。在本工作中，这些特性通过理论和实验得到了验证。对能量耗散的进一步分析揭示了其潜在的物理原理和光学性能。
