Metallic Planar Lens With Binary Nanoscale Slits

Author

Gao, Yang ; Liu, Jianlong ; Zhang, Xueru ; Wang, Yuxiao ; Song, Yinglin ; Liu, Shutian

Author_Institution

Dept. of Phys., Harbin Inst. of Technol., Harbin, China

Volume

24

Issue

11

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

969

Lastpage

971

Abstract

We propose a binary plasmonic lens based on metallic nanoslit array with different fillings. The phase range of π is achieved by changing the refractive indices of the filling materials in the slits. These index-modulated slits are demonstrated to have unique advantages in phase delay compared with the width-modulated ones. The proposed binary structures can keep the advantage in phase modulation and reduce the difficulty in fabrication. Lenses with different functions, such as focusing light to one or two points or correcting oblique incident light, are designed by a simulated annealing algorithm and investigated by the finite-difference time-domain method.

Keywords

finite difference time-domain analysis; lenses; phase modulation; plasmonics; refractive index; simulated annealing; binary nanoscale slits; binary plasmonic lens; binary structures; filling materials; finite-difference time-domain method; index-modulated slits; metallic nanoslit array; metallic planar lens; oblique incident light; phase delay; phase modulation; refractive indices; simulated annealing algorithm; width-modulated ones; Delay; Finite difference methods; Focusing; Lenses; Materials; Metals; Plasmons; Binary optics; subwavelength structures; surface plasmon polaritons;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2191540

Filename

6172213