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Near-field focusing with optical phase antennas

被引：13
作者：
Curto, A. G. [3 ]
Manjavacas, A. [1 ,2 ]
Garcia de Abajo, F. J. [1 ,2 ]
机构：
[1] Univ Vigo, CSIC, Inst Opt, Madrid 28006, Spain
[2] Univ Vigo, CSIC, Unidad Asociada, Madrid 28006, Spain
[3] ICFO Inst Ciencies Foton, Barcelona 08860, Spain
来源：
OPTICS EXPRESS | 2009年 / 17卷 / 20期
关键词：
ENHANCED RAMAN-SCATTERING; MOLECULES;
D O I：
10.1364/OE.17.017801
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigate the near-field focusing properties of three-dimensional phase antennas consisting of concentric rings designed to have source and image spots separated by several microns from the lens. Tight focal spots are obtained for silicon or gold rings patterned in a silica matrix. We analyze in detail the dependence of the performance of these lenses on geometrical parameters such as the number of rings, the ring thickness, and the focal distance. Subwavelength focal spots are found to form at distances of tens of wavelengths from the lens, thus suggesting applications to remote sensing and penlight microscopy and lithography. (C) 2009 Optical Society of America
引用
收藏
页码：17801 / 17811
页数：11
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