Investigation of plasmonic effects on the metal nanoparticle arrays for biosensor applications

Surface plasmon resonance (SPR) on the near field intensity of a two-dimensional (2-D) periodic arrays of bowtie-shape metal nanoparticle (MNP) pairs using the 3-D finite element method (FEM) for biosensor applications are investigated. The peak resonance wavelength can be shifted to red as the filling core media in bowtie-shape MNP pairs have been changed. The tunable and highly sensitive SPR modes are observed due to the hybridization SPR effects. Simulation results show that the peak resonance wavelength (λ_res) can be spread in the full wavelength range of 300-1600 nm when the tip edges and different filling media in structure are taken into account. The highly sensitive optical performances give us a qualitative idea of the geometrical and material properties of the periodic array of bowtie-shape MNP pairs on SPRs that can be as a promising candidate for plasmonic biosensor applications. (paper)