Abstract

In this paper, a ${{\rm Si}_3}{{\rm N}_4} {-} {{\rm CaF}_2}$ hybrid plasmonic waveguide (HPW) with an asymmetric metal cladding is designed for the mid-infrared polarization rotator (PR). The mode characteristics and polarization rotation performances of the ${{\rm Si}_3}{{\rm N}_4} {-} {{\rm CaF}_2}$ HPW-based PR are simulated by using the finite element method. Operating at the wavelength of 3.5 µm, the polarization conversion efficiency between two polarization modes (PM 1 and PM 2) is larger than 99% at a ${{\rm Si}_3}{{\rm N}_4} {-} {{\rm CaF}_2}$ HPW length of 104 µm. The ${{\rm Si}_3}{{\rm N}_4} {-} {{\rm CaF}_2}$ HPW-based PR maintains good polarization rotation performances within fabrication tolerances from ${-}10$ to 10 nm. The polarization rotator based on the ${{\rm Si}_3}{{\rm N}_4} {-} {{\rm CaF}_2}$ HPW paves the way to achieve integrated waveplates, driving many important optical functions from free space onto a chip.

© 2021 Optical Society of America

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