Numerical Analysis of a GaAs-Based Hybrid Plasmonic Waveguide with Nanoscale Optical Confinement and Low Losses

A numerical analysis of a hybrid plasmonic waveguide (HPW) for deep subwavelength optical confinement and long-range propagation with low loss is presented here. Two types material platforms, namely, Si/SiO2/Au GaAs/SiO2/Ag, were analyzed to optimize the HP waveguide. The mode character, an important crucial design parameter waveguides, was calculated based on coupled theory, providing coupling strength between SPP mode. As waveguide, varied from 0.47 0.60 area ranging 0.0002/μm2 0.001/μm2 character near (i.e., |a+(tsi, w, td)|= 0.47). While GaAs/SiO2/Ag 0.57 0.69 0.0004/μm2 approached as |a+(tGaAs, 0.49. Finally, finite element method (FEM) model used investigate modal properties. simulation shows that at td = 10 nm gives 50% larger length (205 μm), ten times smaller (0.0002) 60% lower (0.021 db/μm), 20% stronger (0.62) HPP 0.48 compared Si/SiO2/Au.