Slow Surface Plasmons in Plasmonic Grating Waveguide

Author

Yun Xu ; Jing Zhang ; Guofeng Song

Author_Institution

Inst. of Semicond., Beijing, China

Volume

25

Issue

5

fYear

2013

fDate

1-Mar-13

Firstpage

410

Lastpage

413

Abstract

A metal/air/metal (MAM) plasmonic grating waveguide (PGW) consisting of two parallel silver slabs with periodic corrugations on their inner boundaries is developed to slow down the group velocity of surface plasmon polaritons (SPPs) excited at near-infrared frequencies. For a Gaussian pulse excitation with the full width at half maxim (FWHM) of 222 fs and the center wavelength of 1.58 μm, the group velocity of 0.034c and the group velocity dispersion (GVD) of 0.8 ps/mm/nm can be achieved in finite-difference time-domain (FDTD) simulations with pulse excitation. Furthermore, a chirped PGW with varying groove depth is also demonstrated as a way to trap light by adopting continuous excitation.

Keywords

diffraction gratings; finite difference time-domain analysis; light velocity; optical dispersion; optical waveguides; plasmonics; polaritons; silver; slabs; surface plasmons; Ag-Ag; FDTD; Gaussian pulse excitation; chirped PGW; finite-difference time-domain simulation; groove depth; group velocity dispersion; light trapping; metal-air-metal plasmonic grating waveguide; near-infrared frequency excitation; parallel silver slabs; periodic corrugation; slow surface plasmon polaritons; time 222 fs; wavelength 1.58 mum; Dispersion; Finite difference methods; Optical waveguides; Optimized production technology; Photonics; Plasmons; Time domain analysis; Plasmonic grating waveguide (PGW); slow wave; surface plasmon polaritons (SPPs);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2238667

Filename

6428602