Engineering the dispersion of metamaterial surface for broadband infrared absorption

被引：246
作者：
Feng, Qin [1 ,2 ]
Pu, Mingbo [1 ]
Hu, Chenggang [1 ]
Luo, Xiangang [1 ]
机构：
[1] Chinese Acad Sci, Inst Opt & Elect, State Key Lab Opt Technol Nanofabricat & Microeng, Chengdu 610209, Peoples R China
[2] SW Inst Phys, Chengdu 610041, Peoples R China
来源：
OPTICS LETTERS | 2012年 / 37卷 / 11期
基金：
中国国家自然科学基金;
关键词：
ABSORBER; DESIGN;
D O I：
10.1364/OL.37.002133
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
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. (c) 2012 Optical Society of America
引用
收藏
页码：2133 / 2135
页数：3
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