Sub-wavelength focusing meta-lens

被引：66
|
作者：
Roy, Tapashree [1 ,2 ]
Rogers, Edward T. F. [1 ,2 ]
Zheludev, Nikolay I. [1 ,2 ,3 ]
机构：
[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 BJ, Hants, England
[2] Univ Southampton, Ctr Photon Metamat, Southampton SO17 BJ, Hants, England
[3] Nanyang Technol Univ, Ctr Disrupt Photon Technol, Singapore 637371, Singapore
来源：
OPTICS EXPRESS | 2013年 / 21卷 / 06期
基金：
英国工程与自然科学研究理事会;
关键词：
PROPAGATION; REFRACTION; ARRAY;
D O I：
10.1364/OE.21.007577
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We show that a planar plasmonic metamaterial with spatially variable meta-atom parameters can focus transmitted light into sub-wavelength hot-spots located beyond the near-field of the metamaterial. By nano-structuring a gold film we created an array of meta-lenses generating foci of 160 nm (0.2 lambda) in diameter when illuminated by a wavelength of 800 nm. We attribute the occurrence of sub-wavelength hotspots beyond the near field to the phenomenon of superoscillation. (C) 2013 Optical Society of America
引用
收藏
页码：7577 / 7582
页数：6
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