Enhanced Transmission in a Fiber-Coupled Au Stripe Waveguide System

Author

Lee, Wook-Jae ; Kim, Jae-Eun ; Park, Hae Yong ; Park, Suntak ; Lee, Jong-Moo ; Kim, Min-su ; Ju, Jung Jin ; Lee, Myung-Hyun

Author_Institution

Dept. of Phys., KAIST, Daejeon, South Korea

Volume

22

Issue

2

fYear

2010

Firstpage

100

Lastpage

102

Abstract

We experimentally demonstrated the enhanced transmission in a fiber-coupled Au stripe waveguide system using a linearly tapered (LT) structure at a telecommunication wavelength of 1.55 ??m. The LT structure consists of two 100- ??m-long tapered regions connecting various widths of input and output waveguides with a waist region. The lowest insertion loss of the 1-cm-long LT-Au stripe waveguide is ~ 4.3 dB, when it has 6-??m -wide input and output waveguides and a 4- ??m-wide waist waveguide. The insertion loss is reduced by ~ 2 dB compared to the 4-??m-wide and 1-cm-long straight Au stripe waveguide, which is achieved by decreasing the coupling loss. The losses of the LT region, which has a tapered angle of less than 0.3?? between the input-output waveguides and the waist waveguide, are smaller than 0.4 dB. We showed that the insertion loss of the Au stripe waveguide can be reduced by introducing the LT structure, which can also provide efficient mode conversion.

Keywords

gold; optical fibre couplers; optical fibre losses; optical waveguides; polaritons; surface plasmons; Au; coupling loss; enhanced transmission; fiber-coupled waveguide system; gold stripe waveguide system; input-output waveguides; insertion loss; linearly tapered structure; mode conversion; size 100 mum; surface plasmon polariton; telecommunication wavelength; waist waveguide; wavelength 1.55 mum; Au stripe waveguide; insertion loss; surface plasmon polariton (SPP);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2009.2035634

Filename

5313879