Metallic planar lens formed by coupled width-variable nanoslits for superfocusing

被引：14

作者：

Zhu, Yechuan ^{[1
,2
]}

Yuan, Weizheng ^{[1
,2
]}

Yu, Yiting ^{[1
,2
]}

Diao, Jinshuai ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, Minist Educ, Key Lab Micro Nano Syst Aerosp, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, Key Lab Micro & Nanoelectromech Syst Shaanxi Prov, Xian 710072, Peoples R China

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 15期

基金：

中国国家自然科学基金;

关键词：

PLASMONIC LENSES; SUBWAVELENGTH OPTICS; NANO-SLITS; LIGHT; FILM;

D O I：

10.1364/OE.23.020124

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report a metallic planar lens based on the coupled nanoslits with variable widths for superfocusing. The influence of the interaction between two adjacent nanoslits on the phase delay is systematically investigated using the finite-difference time-domain (FDTD) method. Based on the geometrical optics and the wavefront reconstruction theory, an array of nanoslits perforated in a gold film is optimally designed to achieve the desired phase modulation for light beaming. The simulation result verifies our design in excellent agreement and the realized metallic lens reveals the superfocusing capability of 0.38. in resolution, well beyond the diffraction limit. (C) 2015 Optical Society of America

引用

页码：20124 / 20131

页数：8