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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 (CC BY 3.0).
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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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