Hybridly Polarized Nanofocusing of Metallic Helical Nanocone

Author

Dengfeng Kuang ; Delun Zhang ; Sheng Ouyang

Author_Institution

Key Lab. of Opt. Inf. Sci. & Technol. of the Educ. Minist. of China, Nankai Univ., Tianjin, China

Volume

6

Issue

2

fYear

2014

fDate

Apr-14

Firstpage

1

Lastpage

9

Abstract

We present a metallic helical nanocone, which is a combination of a helical structure and a conic structure. Surface plasmon poloritons are excited at the boundary of the bottom of the helical nanocone, then guided and rotated by the groove provide by the helical structure on the nanocone, and finally, squeezed to the apex of the tip to form a highly localized strong electromagnetic field. The intensity distributions and polarization of the electric fields generated by the metallic helical nanocone are simulated with 3-D finite-difference time-domain method, which indicate that highly confined and hybridly polarized optical fields can be produced at the apex of the metallic helical nanocone.

Keywords

finite difference time-domain analysis; nanophotonics; nanostructured materials; optical focusing; polaritons; surface plasmons; 3-D finite-difference time-domain method; conic structure; electric fields polarization; helical structure; highly localized strong electromagnetic field; hybridly polarized nanofocusing; intensity distributions; metallic helical nanocone; polarized optical fields; surface plasmon polaritons; Electric fields; Finite difference methods; Nanostructures; Optical polarization; Optical sensors; Plasmons; Silver; Plasmonics; nanofocusing; nanostructures; polarization;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2014.2306822

Filename

6744628