Submicron omega-shaped plasmonic polarization rotator

In this paper, a novel compact plasmonic polarization converter is proposed. This rotator is based on conversion between even and odd modes of the coupled nanostrip plasmonic transmission line. The even and odd modes of that line have vertical and horizontal polarization, respectively. The proposed structure is capable of transferring the optical field from the substrate to the surface of the chip. This energy transfer between the surface and the substrate can be utilized for multilevel optical routing in plasmonic circuits. The device is optimized using a genetic algorithm for optimal performance at the optical telecommunication range of 1.55 μm. The cross-coupling is minimized over a wide wavelength range. The results are confirmed using full-wave electromagnetic simulation. The study includes a sensitivity analysis of the device’s response to perturbation in its main parameters. This novel device is appropriate for various applications in telecommunications and biomedical sensing.

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