Calculating impedance variation with frequency of MIM surface plasmon structure for spectroscopic applications

Characteristic impedance of MIM surface plasmon structure is analytically calculated considering the effect of both Faraday inductance and kinetic inductance. Effect of metal layer thickness, insulator thickness and electron density are tailored to observe the impedance variation with frequency. Detailed analytical calculation is made for impedance profile. Coupling between symmetric and antisymmetric modes are reflected by optimum impedance magnitude at very low frequency range, which effectively speaks for double sided surface plasmon. Results are immensely useful for spectroscopic applications.