ANALYTICAL CONSIDERATIONS AND NUMERICAL SIMULATIONS FOR SURFACE PLASMON RESONANCE IN FOUR LAYERS PLASMONIC STRUCTURES WHICH CONTAIN HIGH REFRACTIVE INDEX WAVEGUIDE

The Insulator-Metal-Insulator-Insulator (IMII) plasmonic structures present a great interest for the optical photonics devices. In this paper we present an analyze for coupling of light into plasmonic structures which contains a dielectric waveguide. We obtained the characteristic equation for the wave guides in the IMII structure by solving the Helmholtz equations in four homogeneous media. The characteristic equations for three and four layers have similar forms as established. Subsequently, the numerical simulations for TM waveguide modes and the coupling by a prism with the refractive index lower then waveguide were done. It was showed that, the TM0 mode is confined to the metal interface and can’t be exited. Resonance coupling into higher waveguide modes may be realized for some film thicknesses.

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