超材料
材料科学
宽带
光学
超材料吸收剂
色散(光学)
表面等离子体子
红外线的
带宽(计算)
双曲面模型
德鲁德模型
光电子学
变换光学
吸收(声学)
可调谐超材料
等离子体子
物理
电信
闵可夫斯基空间
量子力学
计算机科学
作者
Feng Qin,Mingbo Pu,Chenggang Hu,Xiangang Luo
出处
期刊:Optics Letters
[The Optical Society]
日期:2012-06-01
卷期号:37 (11): 2133-2133
被引量:247
摘要
We propose a broadband infrared absorber by engineering the frequency dispersion of metamaterial surface (metasurface) to mimic an ideal absorbing sheet. With a thin layer of structured nichrome, a polarization-independent absorber with absorption larger than 97% is numerically demonstrated over a larger than one octave bandwidth. It is shown that the bandwidth enhancement is related with the transformation of the Drude model of free electron gas in metal film to the Lorentz oscillator model of a bound electron in the structured metallic surface. We believe that the concept of dispersion engineering may provide helpful guidance for the design of a broadband absorber.
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