Design of Highly Efficient Hybrid Si-Au Taper for Dielectric Strip Waveguide to Plasmonic Slot Waveguide Mode Converter

摘要

In this paper, we design a dielectric-to-plasmonic slot waveguide modeconverter based on the hybrid silicon-gold taper. The effects of mode matching,the effective index matching, and the metallic absorption loss on theconversion efficiency are studied. Consequently, a metallic taper-funnelcoupler with an overall length of 1.7um is designed to achieve a very highconversion efficiency of 93.3% at 1550 nm. The configuration limitations fornot allowing this mode converter to achieve a 100% conversion efficiency arealso investigated. Such a high-efficiency converter can provide practicalroutes to realize ultracompact integrated circuits.