In this study, a slot-waveguide based polarization rotator (PR) is proposed and designed on silicon-on-isulator platform. Since the entire structure is symetrically distributed along the y = x axis, the optical axies of the excited modes are rotated by 45ְ with respect to the x-axis, which leads to a high polarization conversion efficiency. Simulation results using 3D-FDTD method illustrate that a polarization conversion efficiency of 99.7% is obtained with a device length of only 8 µm at wavelength of 1.55 µm. The corresponding extinction ratio is –25.9dB and insertion loss is 1.19dB. Additionally, the wavelength dependence of the proposed PR is also discussed in detail.
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