Jiang Xiaoyun, Zhou Leiming, Hu Jigang, Wang Tao
Opt Express. 2022 Mar 28;30(7):11504-11513. doi: 10.1364/OE.451849.
Highly efficient solar-to-thermal conversion is desired for the renewable energy technologies, such as solar thermo-photovoltaics and solar thermo-electric systems. In order to maximize the energy conversion efficiency, solar-selective absorbers are essential with its absorption characteristics specially tailored for solar applications. Here, we propose a wideband spectral-selective absorber based on three-dimensional (3D) nanostructured hyperbolic metamaterial (HMM), which can realize near-unity absorption across the UV and NIR spectral ranges. Moreover, the optical topological transition (OTT) of iso-frequency surface (IFS) is manipulated to selectively enhance light absorption in the entire solar spectrum, crucial for improved energy utilization. Impressive solar-to-thermal conversion efficiency of 95.5% has been achieved. Particularly, such superior properties can be retained well even over a wide range of incident angles. These findings open new avenues for designing high-performance solar thermal devices, especially in the fields related to solar energy harvesting.
对于太阳能热光伏和太阳能热电系统等可再生能源技术而言，高效的太阳能到热能转换是人们所期望的。为了使能量转换效率最大化，具有专门为太阳能应用量身定制的吸收特性的太阳能选择性吸收器至关重要。在此，我们提出一种基于三维（3D）纳米结构双曲超材料（HMM）的宽带光谱选择性吸收器，它可以在紫外和近红外光谱范围内实现近乎单位的吸收。此外，操控等频面（IFS）的光学拓扑转变（OTT）以在整个太阳光谱中选择性增强光吸收，这对于提高能量利用至关重要。已经实现了令人印象深刻的95.5%的太阳能到热能转换效率。特别地，即使在很宽的入射角范围内，这种优异性能也能很好地保持。这些发现为设计高性能太阳能热装置开辟了新途径，尤其是在与太阳能收集相关的领域。
