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Sensors 2010, 10(12), 11390-11399; doi:10.3390/s101211390
Article

Resolution Enhancement in Surface Plasmon Resonance Sensor Based on Waveguide Coupled Mode by Combining a Bimetallic Approach

1,* , 2
, 2
, 1
 and 1
1 Electronic Materials Center, Korea Institute of Science and Technology, Seoul 136-791, Korea 2 Department of Materials Science and Engineering, Myongji University, Yongin 443-749, Korea
* Author to whom correspondence should be addressed.
Received: 20 August 2010 / Revised: 23 November 2010 / Accepted: 7 December 2010 / Published: 13 December 2010
(This article belongs to the Section Biosensors)
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Abstract

In this study, we present and demonstrate a new route to a great enhancement in resolution of surface plasmon resonance sensors. Basically, our approach combines a waveguide coupled plasmonic mode and a kind of Au/Ag bimetallic enhancement concept. Theoretical modeling was carried out by solving Fresnel equations for the multilayer stack of prism/Ag inner-metal layer/dielectric waveguide/Au outer-metal layer. The inner Ag layer couples incident light to a guided wave and makes more fields effectively concentrated on the outer Au surface. A substantial enhancement in resolution was experimentally verified for the model stack using a ZnS-SiO2 waveguide layer.
Keywords: waveguide coupled surface plasmon resonance; bimetallic approach; high resolution SPR sensor waveguide coupled surface plasmon resonance; bimetallic approach; high resolution SPR sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lee, K.-S.; Son, J.M.; Jeong, D.-Y.; Lee, T.S.; Kim, W.M. Resolution Enhancement in Surface Plasmon Resonance Sensor Based on Waveguide Coupled Mode by Combining a Bimetallic Approach. Sensors 2010, 10, 11390-11399.

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