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Plasmonics

, Volume 5, Issue 4, pp 347–354 | Cite as

Theoretical Investigation of an Interferometer-type Plasmonic Biosensor Using a Metal-insulator-silicon Waveguide

  • Min-Suk KwonEmail author
Article

Abstract

This work proposes and investigates theoretically a biosensor that is an integrated plasmonic Mach–Zehnder interferometer. The biosensor consists of three sections. The first and third sections are input and output dielectric waveguides whose core is a silicon film. The second section is a combination of a surface plasmon polariton waveguide and a metal-insulator-silicon waveguide, which are separated by a thick gold film. The former and the latter function as sensing and reference arms, respectively. The latter supports a mode whose fields are highly enhanced in a thin insulator, silicon nitride film, and it has relatively small propagation loss. It is shown that the biosensor has insertion loss lower than 2 dB, and that it is very compact since the length of its second section for sensing is shorter than 6 μm. In addition, it is discussed that it can be easily implemented by using simple fabrication processes. Analyzed are the characteristics of sensing a refractive index change of liquid covering the biosensor. Despite its compactness, they are similar to those of previous surface plasmon interferometers. Also, its characteristics as a DNA sensor are analyzed. The analysis demonstrates that the biosensor can detect sensitively target single-stranded DNAs whose total weight is smaller than 10 fg.

Keywords

Surface plasmon polariton Biosensor Interferometer Hybrid plasmonic waveguide Integrated plasmonics 

Notes

Acknowledgment

This work was supported by National Research Foundation of Korea Grant funded by the Korean Government (KRF-2008-313-D00725).

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of Optical EngineeringSejong UniversitySeoulRepublic of Korea

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