Metamaterials with gradient negative index of refraction

被引：48
作者：
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113, United States [1 ]
机构：
[1] Department of Chemistry, Northwestern University, Evanston, IL 60208-3113
来源：
J Opt Soc Am A | 2007年 / 10卷 / A39-A44期
关键词：
Refraction;
D O I：
10.1364/JOSAA.24.000A39
中图分类号：
学科分类号：
摘要：
We propose a new metamaterial with a gradient negative index of refraction, which can focus a collimated beam of light coming from a distant object. A slab of the negative refractive index metamaterial has a focal length that can be tuned by changing the gradient of the negative refractive index. A thin metal film pierced with holes of appropriate size or spacing between them can be used as a metamaterial with the gradient negative index of refraction. We use finite-difference time-domain calculations to show the focusing of a plane electromagnetic wave passing through a system of equidistantly spaced holes in a metal slab with decreasing diameters toward the edges of the slab. © 2007 Optical Society of America.
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页码：A39 / A44
页数：5
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