Total absorption of unpolarized light by crossed gratings

被引:81
作者
Popov, E. [1 ]
Maystre, D. [1 ]
McPhedran, R. C. [1 ,2 ]
Neviere, M. [3 ]
Hutley, M. C. [4 ]
Derrick, G. H. [2 ]
机构
[1] Domaine Univ St Jerome, CNRS, Aix Marseille Univ, Inst Fresnel, F-13397 Marseille 20, France
[2] Univ Sydney, Sch Phys, CUDOS, Sydney, NSW 2006, Australia
[3] Inst Univ France, F-75005 Paris, France
[4] Formerly Natl Phys Lab, Teddington, Middx, England
关键词
D O I
10.1364/OE.16.006146
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We present both experimental and numerical data showing the absorption of unpolarized, normally incident light by a gold crossed grating having a shallow sinusoidal profile. We show furthermore that the total absorption of unpolarized light can be achieved for an angle of incidence of 30 degrees with a crossed grating having its period adjusted appropriately from the normal incidence case to preserve the plasmonic resonance responsible for the enhanced absorptance. We contrast the process for achieving high absorptance in the principal plane of incidence aligned with the grooves of one of the gratings, with that for the principal plane at 45 degrees to each grating. (c) 2008 Optical Society of America.
引用
收藏
页码:6146 / 6155
页数:10
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