Simulation of EM wave propagating in a nanowire-base localized surface plasma resonance sensor

We studied the dependence of the sensitivity in a localized surface plasmon resonance with the nanostructure. An localized magnetic surface plasmon resonance was modeled in a two nanowires with underlying gold thin film connection. The results show has high electric fields exist between the wire edges indicating a strong displacement current flowing anti-parallel along the wire. This current will generate magnetic field concentrated in the space between the wires. The response of the nanowire based array resembles the behaviour of single pair nanostructure, then exhibits huge intensity enhancement at the excitation frequency and contributes the sensitivity. Localized surface plasmon modes can be excited when the wire diameter is approximately equal to the skin depth, and the wire-pair is separated to a applicable distance.