Mehrabi Mohammad, Rajabalipanah Hamid, Abdolali Ali, Tayarani Majid
Appl Opt. 2018 May 10;57(14):3693-3703. doi: 10.1364/AO.57.003693.
Because of exhibiting extraordinary features, metamaterial absorbers have captured considerable attention in recent years, especially at visible frequencies. In this paper, a new design of a metamaterial-inspired perfect visible absorber (MIPVA) is investigated, which exhibits ultra-broadband, polarization-independent, and wide-angle performances. The proposed MIPVA provides a flat and near unity absorbance (>99%) in an ultra-broad range of radiation wavelengths from λ=500 to 625 nm, while retaining its convincing absorptivity over the entire visible wavelengths. A comprehensive parametric study is accomplished to demonstrate the effects of structural parameters on the absorptivity of the designed MIPVA. To clarify the physical mechanism of absorption, the electric field and surface current distributions of MIPVA are also monitored and elaborately discussed throughout the paper. The results show that the proposed MIPVA exhibits a polarization-insensitive absorption behavior in a wide range of incident wave angles. The interference theory is also utilized to verify the results. In addition, our MIPVA has a compact and low-profile design, while its ability to absorb solar radiation is significantly improved with respect to preceding studies in terms of both the frequency bandwidth and absorptivity; thereby, it is a worthy candidate to play an essential role in different visible-range applications.
由于具有非凡的特性，超材料吸收体近年来受到了广泛关注，尤其是在可见光频率范围内。本文研究了一种受超材料启发的新型完美可见光吸收体（MIPVA）的设计，该吸收体具有超宽带、偏振无关和广角性能。所提出的MIPVA在从λ = 500到625 nm的超宽辐射波长范围内提供平坦且接近单位的吸光度（> 99%），同时在整个可见波长范围内保持令人信服的吸收率。完成了一项全面的参数研究，以证明结构参数对所设计的MIPVA吸收率的影响。为了阐明吸收的物理机制，本文还监测并详细讨论了MIPVA的电场和表面电流分布。结果表明，所提出的MIPVA在宽范围的入射波角度下表现出偏振不敏感的吸收行为。还利用干涉理论验证了结果。此外，我们的MIPVA具有紧凑和低剖面的设计，并且在频率带宽和吸收率方面相对于先前的研究显著提高了其吸收太阳辐射的能力；因此，它是在不同可见光范围应用中发挥重要作用的一个有价值的候选者。
