Bimetallic waveguide coupled surface plasmon resonance sensor chip with high resolution

Title
Bimetallic waveguide coupled surface plasmon resonance sensor chip with high resolution
Authors
이경석손주명정대용김원목
Keywords
Bimetallic; Sensor; Waveguide coupled; Surface plasmon resonance
Issue Date
2010-11
Publisher
한국센서학회
Citation
, 65-65
Abstract
In this study, we present and demonstrate a new route to a great enhancement in resolution of surface plasmon resonance sensor. 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, and the pratical sensor with a slim stack was successively fabricated by adopting high index ZnS-SiO2 dielectric waveguide with good adhesion properties with noble metal. The use of Ag inner coupling layer between the prism and the dielectricwaveguide fllm was confirmed to have advantages in enhancing the sharpness of SPR curve as well as the local field at the Au surface interacting with analytes, thus improving the sensing capability, especially in terms of sensing resolution and dynamic range. As the ralative ratio of Ag to Au increases, the line width of the reflectivity curve decreased more significantly, and the corresponding resolution of the sensor was verified to be reflectivity curve decreased more significantly, and the corresponding resolution of the sensor was verified to be reflectivity curve decreased more significantly, and the corresponding resolution of the sensor was verified to be greatly improved to detect the smaller change in the refractive index of surrounding medium. This research was supported by a grant from Center for Nanostructured Materials Technology(2010K000341).
URI
http://pubs.kist.re.kr/handle/201004/38683
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KIST Publication > Conference Paper
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