| With the high-speed development of nanometer technology and devices for integration, the miniaturization’s demand is higher and higher, the limitation of traditional waveguide due to the diffraction limit, can not satisfy the needs of the development gradually. Surface plasmon polaritons(SPPs) is a type of electromagnetic mode exsiting on the metal-dielectric interface,which can confine the energy in the sub-wavelength dimension beyond the diffraction limit. Thus,it is possible for waveguides to break through the diffraction limit. Therefore, the surface plasmon polariton waveguides using this kind of technology will have widely application prospect in integrated of optics and highly integrated devices.In this paper, a novel long-range dielectric-loaded surface plasmon polariton waveguide(LR-DLSPPW) structure based on the principle of the golden ratio is proposed based on the traditional LR-DLSPPW. Transmission characteristics like the normalized electric field distribution, mode effective refractive index, normalized attenuation constant, propagation distance, mode width, figure of merit(FOM), and the coupling length of this kind of waveguide have been analyzed and numerically calculated via the finite element method(FEM) of the COMSOL Multiphysics software at the telecom wavelength of λ0 =1.55 μm. The results show that the LR-DLSPPW based on the priciple of golden ratio has a longer propagation distance and a relatively smaller mode width compared to the non-golden ratio waveguides. On the other hand, When the height-width ratio of the dielectric ridge is at the golden ratio with a fixed area of0.9 μm 2, its FOM has a maxmum value larger than 6.15×105. In addition, the crosstalk can be ignored when the distance of two adjacent waveguides exceeds 3μm. Consequently, the designed waveguide has significant potential for applications in design of high density integrated optoelectronic circuits. |
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