Dispersion characteristics of asymmetric multistep titanium nitride channel plasmon waveguide

Abstract

Plasmonic waveguides is a hot topic in the field of photonic devices due to the ability to provide signal propagation in nanoscales beyond the diffraction limit. Reducing the dimensions of optical components allows for increasing of integration density and reduce the cost of fabrication. In this paper, the dispersion characteristics of the Channel Plasmon Polaritons CPPs waveguide based on Titanium Nitride TiN material are presented. The proposed design is simulated numerically to obtain the optimum dimensions that provide longer propagation length with low loss. The asymmetric trench waveguide design shows superior performance compared to the symmetric waveguide due to the increase in the mode confinement through the groove. A 100 μm propagation length is achieved at λ = 1.6 μm by increasing the asymmetry of the trenches. TiN based waveguide provides a good alternative to the already existing CPPs waveguide designed based on gold and silver materials in terms of cost and the chemical stability. A low cost (compared to gold) and non-oxidize (compared to silver) CPPs waveguide model is proposed and simulated.