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

Authors
Lee, Kyeong-SeokSon, Ju MyeongJeong, Dae-YongLee, Taek SungKim, Won Mok
Issue Date
2010-12
Publisher
MDPI
Citation
SENSORS, v.10, no.12, pp.11390 - 11399
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
SENSITIVITY; BIOSENSORS; SENSITIVITY; BIOSENSORS; waveguide coupled surface plasmon resonance; bimetallic approach; high resolution SPR sensor
ISSN
1424-8220
URI
https://pubs.kist.re.kr/handle/201004/130868
DOI
10.3390/s101211390
Appears in Collections:
KIST Article > 2010
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