Abstract

In this chapter, tunable plasmonic properties of multilayer spherical nanoshells based on quasi static approach and plasmon hybridization theory are investigated. The bimetallic nanoshells with three intensive plasmon resonances could be used as excellent replacement for monometallic nanoshell, with double plasmon resonances, in sensing applications based on surface enhanced Raman scattering (SERS), because the Raman scattering could be greatly enhanced at plasmon resonances. The plasmon resonance peaks in bimetallic nanoshells are optimized by tuning the geometrical parameters. In addition, the optimal geometry is discussed to obtain the Raman enhancement factor in bimetallic multilayer nanoshell. SERS enhancement factor is calculated with consideration of dampings due to both the electron scattering and the radiation at the boundary and modified Drude model in dielectric function of bimetallic nanoshell. Beyond the geometrical parameters, the refractive index of surrounding medium can also affect the plasmon resonance of the bimetallic nanoshells. Any variation in blood concentration and oxygen level can be detected by these bimetallic nanoshells with high sensitivity.

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