Heidari M H, Sedighy S H
J Opt Soc Am A Opt Image Sci Vis. 2018 Apr 1;35(4):522-525. doi: 10.1364/JOSAA.35.000522.
In this paper, a new ultra-thin and broadband wide-angle polarization-insensitive metasurface solar absorber is designed and optimized. The proposed metasurface absorber topology is optimized by using a genetic algorithm to enhance the bandwidth and decrease the unit cell area. The proposed unit cell is designed with fourfolded symmetric subunit cells rotated in the clockwise direction to achieve a polarization-independent response. The unit cell with 320×320 nm area and 50 nm thickness has a broadband (≥90%) absorption response in the visible frequency region of the solar spectrum and infrared from 350 THz to 700 THz for normal incident angles and higher than 70% for incident angles up to 40° at both polarizations.
本文设计并优化了一种新型超薄宽带广角偏振不敏感超表面太阳能吸收器。通过遗传算法对所提出的超表面吸收器拓扑结构进行优化，以提高带宽并减小单元胞面积。所提出的单元胞由四个沿顺时针方向旋转的对称子单元组成，以实现与偏振无关的响应。面积为320×320 nm且厚度为50 nm的单元胞在太阳光谱的可见光频率区域以及350太赫兹至700太赫兹的红外波段，对于垂直入射角具有宽带（≥90%）吸收响应，对于两种偏振下高达40°的入射角，吸收响应高于70%。
