Polarization splitter with hybrid plasmonic waveguide

We propose a design for a CMOS compatible three-core directional-coupler-based polarization splitter that incorporates a hybrid plasmonic waveguide. The large polarization selectivity of the hybrid plasmonic waveguide allows only the TM mode to evanescently couple to the cross port of the directional coupler, while the TE mode is confined to the through port. FDTD simulations show that the proposed polarization splitter can achieve peak extinction ratios of 23 dB over a 15 dB bandwidth of 82 nm, while having low insertion losses of <;1 dB.