  A novel method for increasing the extinction ratio of plasmonic waveguide
polarizer has been investigated in this work. Aluminum was coated in a 20
microns multi-strips pattern on the top of a SU-8 waveguide to excite the
surface plasmons. Simulation and experimental results have been shown the
extinction ratio of the multi-strip polarizer is more than the single strip
ones with the same total aluminum-coated length due to the coupling loss
between Al coated and uncoated region and also the scattering at the edge of
metal. This polarizer was characterized over a wide range of wavelengths and
showed a high extinction ratio of 46 dB at 1550 nm and 26.8 dB at 980 nm
wavelengths.
