"Digitally" Addressable Focusing of Light into a Subwavelength Hot Spot
"Digitally" Addressable Focusing of Light into a Subwavelength Hot Spot
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DOI：
10.1021/nl2043437
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发表时间：
2012-06-01
期刊：
影响因子：
10.8
通讯作者：
Zheludev, N. I.
中科院分区：
文献类型：
--
作者：
Kao, T. S.;Rogers, E. T. F.;Zheludev, N. I.
我们表明，等离子体超材料可以作为一个远场到近场的Transformer，将自由空间光束聚焦到一个亚波长的能量热点在一个规定的位置，光斑大小只有一小部分的波长。超材料上的热点位置可以简单地通过调制输入相位分布以“数字”方式从阵列的一个超分子随意规定和移动到另一个超分子，从而为成像和光学数据处理提供新的机会。
We show that a plasmonic metamaterial can act as a far-field to near-field transformer that focuses a free-space beam of light into a subwavelength energy hot spot at a prescribed location with a spot size only a small fraction of the wavelength. The hot spot position on the metamaterial can be prescribed and moved at will from one metamolecule of the array to another in a "digital" fashion simply by modulating the input phase profile, thus providing new opportunities for imaging and optical data processing.