Shen Zhe, Ni Junfan
School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Nanomaterials (Basel). 2024 Dec 6;14(23):1959. doi: 10.3390/nano14231959.
Currently, perfect absorption properties of metamaterials have attracted widespread interest in the area of solar energy. Ultra-broadband absorption, incidence angle insensitivity, and polarization independence are key performance indicators in the design of the absorbers. In this work, we proposed a metamaterial absorber based on the absorption mechanism with multiple resonances, including propagation surface plasmon resonance (PSPR), localized surface plasmon resonance (LSPR), electric dipole resonance (EDR), and magnetic dipole resonance (MDR). The absorber, consisting of composite nanocylinders and a microcavity, can perform solar energy full-spectrum absorption. The proposed absorber obtained high absorption (>95%) from 272 nm to 2742 nm at normal incidence. The weighted absorption rate of the absorber at air mass 1.5 direct in the wavelength range of 280 nm to 3000 nm exceeds 98.5%. The ultra-broadband perfect absorption can be ascribed to the interaction of those resonances. The photothermal conversion efficiency of the absorber reaches 85.3% at 375 K. By analyzing the influence of the structural parameters on the absorption efficiency, the absorber exhibits excellent fault tolerance. In addition, the designed absorber is insensitive to polarization and variation in ambient refractive index and has an absorption rate of more than 80% at the incident angle of 50°. Our proposed absorber has great application potential in solar energy collection, photothermal conversion, and other related areas.
目前，超材料的完美吸收特性在太阳能领域引起了广泛关注。超宽带吸收、入射角不敏感性和偏振无关性是吸收体设计中的关键性能指标。在这项工作中，我们基于包括传播表面等离子体共振（PSPR）、局域表面等离子体共振（LSPR）、电偶极共振（EDR）和磁偶极共振（MDR）在内的多共振吸收机制，提出了一种超材料吸收体。该吸收体由复合纳米圆柱和微腔组成，能够实现太阳能全光谱吸收。所提出的吸收体在正入射时，在272nm至2742nm范围内获得了高于95%的高吸收率。该吸收体在空气质量1.5直射条件下，在280nm至3000nm波长范围内的加权吸收率超过98.5%。这种超宽带完美吸收可归因于这些共振的相互作用。该吸收体在375K时的光热转换效率达到85.3%。通过分析结构参数对吸收效率的影响，该吸收体表现出优异的容错能力。此外，所设计的吸收体对偏振和环境折射率变化不敏感，在入射角为50°时吸收率超过80%。我们提出的吸收体在太阳能收集、光热转换及其他相关领域具有巨大的应用潜力。
