A novel ultra-compact polarization rotator (PR) based on surface plasmon polaritons waveguide is proposed. The total footprint of the proposed device is only 0.44µm×2.55µm.
Simulations with 3D-FDTD show that the PR has a broad bandwidth (1.4µm∼1.7µm) with extinction ratios larger than 10dB. The insertion losses are less than 1dB during the wavelength range of 1450nm∼1650nm.