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首页> 外文期刊>Optics Letters >Metallic rugate structures for near-perfect absorbers in visible and near-infrared regions
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Metallic rugate structures for near-perfect absorbers in visible and near-infrared regions

机译：用于可见光和近红外区域的近乎完美吸收体的金属波纹结构

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摘要

Metallic rugate structures are theoretically investigated for achieving near-perfect absorption in the visible and near-infrared regions. Our model builds on nanoporous metal films whose porosity (volume fraction of voids) follows a sinewave along the film thickness. By setting the initial phase of porosity at the top surface as 0, near-perfect absorption is obtained. The impacts of various structural parameters on the characteristic absorption behaviors are studied. Furthermore, multiple peaks or bands with high absorption can be achieved by integrating several periodicities in one structure. The rugate absorbers show near-perfect absorption for TE and TM polarizations and large incident angles.
机译：从理论上研究了金属褶皱结构，以在可见光和近红外区域实现近乎完美的吸收。我们的模型建立在纳米多孔金属膜上，其孔隙率（空隙的体积分数）沿膜厚沿正弦波变化。通过将顶表面的孔隙率的初始相位设置为0，可以获得近乎完美的吸收。研究了各种结构参数对特征吸收行为的影响。此外，可以通过在一个结构中整合多个周期性来获得具有高吸收率的多个峰或带。皱纹吸收剂对TE和TM极化和大入射角显示出近乎完美的吸收。

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