Grating-Assisted Excitation of Short-Range Surface Plasmon Polariton Mode

Author

Qing Liu ; Kee, J.S. ; Mi Kyoung Park

Author_Institution

Dept. of Bioelectronics, Agency for Sci., Technol. & Res., Singapore, Singapore

Volume

25

Issue

15

fYear

2013

fDate

Aug.1, 2013

Firstpage

1420

Lastpage

1423

Abstract

We propose an anti-symmetric grating structure for effective excitation of the short-range surface plasmon polariton (SR-SPP) mode of a metal stripe waveguide. The structure consists of two corrugated Bragg gratings offset by half of a period formed on the two sides of the metal stripe, respectively. The SR-SPP mode is excited in the backward direction by the long-range surface plasmon polariton mode launched into the waveguide. We investigate the effects of the metal stripe thickness, the grating corrugation depth, and the number of grating periods on the transmission and reflection characteristics of the grating with the finite-difference time-domain method in detail. Our numerical results show that a peak reflection of ~57% in the SR-SPP mode can be achieved with a 50-μm long grating on a 40-nm thick gold stripe.

Keywords

Bragg gratings; finite difference time-domain analysis; gold; optical waveguides; polaritons; reflectivity; surface plasmons; ultraviolet spectra; Au; SR-SPP mode; antisymmetric grating structure; corrugated Bragg gratings; finite-difference time-domain method; gold stripe; grating corrugation depth; grating periods; grating-assisted excitation; long-range surface plasmon polariton mode; metal stripe thickness; metal stripe waveguide; numerical method; reflection; reflection characteristics; short-range surface plasmon polariton mode; size 40 nm; size 50 mum; transmission characteristics; Bragg gratings; long-range surface plasmon; optical filters; optical sensors; short-range surface plasmon;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2266334

Filename

6531656