Liu Xiaoyu, Qian Qinyu, Chen Haitao, Fan Li, Cheng Liwen, Zhao Liang, Wang Chinhua
Appl Opt. 2023 Oct 10;62(29):7766-7772. doi: 10.1364/AO.497849.
We report a metasurface cutoff perfect absorber (MCPA) in the solar energy wavelength band based on the double Mie resonances generated from the silicon and gallium arsenide nanoring arrays grown on the Al layer in the solar energy wavelengths. A high average absorption of 0.910 in the absorption band and almost eliminated absorption in the nonabsorption band are realized within only 120 nm thick structures. The MCPA is of a sharp cutoff between the absorption and nonabsorption band, whose extinction ratio, extinction difference, and cutoff slope are 9.4 dB, 0.8, and 0.0019 , respectively. The proposed MCPA suggests an efficient way to design a solar thermal absorber, which is of great importance in renewable energy, such as for solar thermal applications.
我们报道了一种基于太阳能波长下生长在铝层上的硅和砷化镓纳米环阵列产生的双米氏共振的太阳能波长带中的超表面截止完美吸收体（MCPA）。在仅120nm厚的结构中，实现了吸收带内0.910的高平均吸收率以及非吸收带内几乎消除的吸收。MCPA在吸收带和非吸收带之间具有陡峭的截止，其消光比、消光差和截止斜率分别为9.4dB、0.8和0.0019 。所提出的MCPA为设计太阳能热吸收器提供了一种有效方法，这在可再生能源中，如太阳能热应用中具有重要意义。
