A THz semiconductor hybrid plasmonic waveguide with fabrication-error tolerance

Abstract

In this letter, a novel waveguide based on semiconductor THz hybrid surface plasmon polariton (STHSPP) is proposed and numerically analyzed. The structure under study can confine light in the ultradeep-subwavelength region (ranging from λ2/360 to λ2/156) with a large propagation length ranging from 374 to 506 µm. Compared with a conventional hybrid SPP (HSPP) waveguide without a ridge, our proposed structure with the same propagation length has a much higher mode confinement with a one order of magnitude smaller normalized mode area.