1. Resolution Enhancement in Surface Plasmon Resonance Sensor Based on Waveguide Coupled Mode by Combining a Bimetallic Approach
- Author
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Ju Myeong Son, Won Mok Kim, Kyeong Seok Lee, Taek Sung Lee, and Dae-Yong Jeong
- Subjects
Waveguide (electromagnetism) ,Materials science ,Silver ,Time Factors ,Light ,Physics::Optics ,Biosensing Techniques ,lcsh:Chemical technology ,Biochemistry ,high resolution SPR sensor ,Models, Biological ,Article ,Analytical Chemistry ,Optics ,lcsh:TP1-1185 ,Electrical and Electronic Engineering ,Surface plasmon resonance ,Instrumentation ,bimetallic approach ,Plasmon ,Guided wave testing ,business.industry ,Fresnel equations ,Models, Theoretical ,Surface Plasmon Resonance ,Image Enhancement ,Surface plasmon polariton ,Atomic and Molecular Physics, and Optics ,waveguide coupled surface plasmon resonance ,Refractometry ,Prism ,Gold ,business ,Localized surface plasmon - 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.
- Published
- 2010