Mode Analysis and Characterization of Absorptive Interference Resonators

The description of the role of absorption in interference resonators is important for characterization of metal-insulator-metal structures. To study the resonance characteristics of the interference structures the conditions of excitation of their eigenmodes were analyzed. The mode excitation conditions determined by the dispersion relations were obtained for the waveguide, Fabry-Pérot, symmetric and antisymmetric plasmonic normal modes. The approximations of the dispersion relations in the form of analytical functions were implemented to describe the behavior of the resonance positions in far-field spectra depending on the parameters of the layers.