Study on Transmission Characteristics of a Hybrid Triangle Wedge Surface Plasmonic Polaritons Waveguide with Subwavelength Mode Confinement

A novel metal-dielectric-metal (MDM) waveguide based on the hybrid surface plasmonic polaritons (HSPPs) is proposed and numerically analyzed. This waveguide consists of two metal triangle wedge is placed on both sides of dielectric nanowires. Analytical and numerical calculations based on the finite element method (FEM) are carried out at the telecommunication wavelength λ = 1.55 μm. The numerical results show that it can confine light in the ultra-deep-subwavelength region with long propagation distance relative to the distance in the MDM waveguide without metal triangle. Detailed study of this structure reveals that these advantages originate from the tip enhancement of the triangle semiconductor waveguide. At 120°, its propagation distance increase 18% and mode area decrease 65%. So various applications will benefit from the hybrid plasmonic polariton waveguides, such as the laser, coupler and photonic integrated circuits.