title: Resolution enhancement in surface plasmon resonance sensor based on waveguide coupled mode by combining a bimetallic approach.
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.
authors.affiliation: Electronic Materials Center, Korea Institute of Science and Technology, Seoul 136-791, Koreakslee21@kist.re.kr
authors.forename: Kyeong-Seok
authors.initials: KS
authors.lastname: Lee
authors.forename: Ju Myeong
authors.initials: JM
authors.lastname: Son
authors.forename: Dae-Yong
authors.initials: DY
authors.lastname: Jeong
authors.forename: Taek Sung
authors.initials: TS
authors.lastname: Lee
authors.forename: Won Mok
authors.initials: WM
authors.lastname: Kim
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D006046:Gold / Q000737:chemistry*; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods; D008027:Light; D008954:Models, Biological; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation / Q000379:methods; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods; D013997:Time Factors
chemical_list: D012834:Silver; D006046:Gold