Optimized aperiodic broadband visible absorbers

被引：11
|
作者：
Granier, Christopher H. [1 ]
Lorenzo, Simon G. [1 ,2 ]
You, Chenglong [1 ]
Veronis, Georgios [2 ,3 ]
Dowling, Jonathan P. [1 ]
机构：
[1] Louisiana State Univ, Hearne Inst Theoret Phys, Dept Phys & Astron, Baton Rouge, LA 70803 USA
[2] Louisiana State Univ, Ctr Computat & Technol, Baton Rouge, LA 70803 USA
[3] Louisiana State Univ, Sch Elect Engn & Comp Sci, Baton Rouge, LA 70803 USA
来源：
JOURNAL OF OPTICS | 2017年 / 19卷 / 10期
基金：
美国国家科学基金会;
关键词：
nanophotonics; physical optics; absorbers; ABSORPTION; ULTRATHIN;
D O I：
10.1088/2040-8986/aa8673
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We design a visible wavelength range broadband absorber based on an optimized aperiodic structure, which is capable of almost doubling the absorptance in the visible range, in comparison to tungsten. Our optimized structure is either a tungsten-air or a tungsten-silicon carbide multilayer stack on top of a tungsten substrate. We achieve almost perfect impedance matching between this structure and air. We find that the high absorptance is not related to resonances with high quality factors and no field enhancement is observed, which is in agreement with the broadband and broad-angle absorptance of our structure.
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页数：7
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