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A High Extinction Ratio Plasmonic Waveguide Polarizer

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.

preprint2020arXivOpen access
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