Investigation On The Power Coupling Between Metal-Insulator-Metal Plasmonic And Dielectric Slab Waveguides

Surface Plasmons(SPPs)is a kind of collective oscillation behavior caused by the electrons at the interface of metal and dielectric under the applied high frequency electromagnetic field,which transimit in the form of dense waves along the metal surface.The surface plasmons can be bound to the surface of metal and medium,overcome the diffraction limit of light wave,and become one of the important ways to make nanometer optical waveguide circuit and realize miniaturization and integration of optical device.The metal-dielectric-metal(MIM)waveguide structure is capable of transmitting surface plasmon,and the MIM waveguide structure is simple and easy to fabricate,and has strong binding with the surface plasmon.Therefore,the metal-dielectric-metal waveguide structure has attracted the attention of many researchers.In this paper,we present a new model for a Nano-Coupler between Metal-Insulator-Metal Plasmonic and Dielectric Slab Waveguides,raising its power coupling by using the resonance effect at the waveguide junction and demonstrated numerically by the finite-different time-domain(FDTD)method.The results indicate that when wavelength is 1.55?m the distance between resonator with junction is 230 nm and the depth is 420 nm,the power coupling will be improved 20% to 30%.another resonator is introduced on both sides of the MIM waveguide,can guarantee the transmission efficiency and the spectral width of the peak transmission narrowed;finally,when the cavity on both sides of the horizontal displacement,the transmittance increases with two cavity spacing and decreases.Based on the mode field analysis of waveguide structure,the physical mechanism of transmission enhancement in waveguide structure is explained based on the F-P resonance effect.The results of this study provide a valuable reference for the efficient coupling of dielectric waveguide and surface plasmon polaritons.