In this paper we show by three dimensional simulation the beam propagation in dielectric loaded surface plasmon-polariton waveguides (DLSPPWs) is more suitable comparison with the dielectric waveguides (the substrate is also dielectric). The best dimentions for these dielectric ridge is 600 nm for its with and thickness in 1.55 nm wave length. In two waveguides structures the coupling between them is occurred at the characteristic length. In this length the energy flux is transferred from one waveguide to other waveguide and vice versa. The speed of this transfering is increased when the distance between two waveguide is decreased.

Keywords: Surface Plasmon, Dielectrics, Waveguides.

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