Coupling of localized surface plasmon modes in compound structure with metallic nanoparticle and nanohole arrays.

We have investigated the effect of the coupling of localized surface plasmon (LSP) on the transmission properties of a compound structure with metallic particle and hole arrays. It is found that the variation in longitudinal interval G between particle and hole arrays leads to the shift in transmission peak and the new transmission peak, which are due to the change in coupling strength of LSP modes and the formation of coaxial guide mode, respectively. The lateral displacement L_x (parallel to the polarization direction of incident light) results in the splitting of transmission peak, originating from the variation in coupling manner of LSP modes, while the lateral displacement L_y (perpendicular to the polarization direction of incident light) causes the reduction and redshift in transmission peak. [ABSTRACT FROM AUTHOR]