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Design of a Broadband Polarization Splitter Based on Anisotropy-Engineered Tilted Subwavelength Gratings Herrero-Bermello, Alaine Luque-González, José Manuel Villafranca Velasco, Aitor Ortega-Moñux, Alejandro Cheben, Pavel Halir, Robert Redes de banda ancha Polarization management is of paramount importance in integrated optics, partic- ularly for highly birefringent photonic platforms such as silicon-on-insulator. In this paper, we present a polarization beam splitter based on a multimode interference coupler incorporating tilted subwavelength gratings. The tilt provides accurate control of the structural anisotropy and enables independent selection of the beat length for two orthogonal polarization states. As a result, device length is reduced to less than 100 μm while simultaneously achiev- ing broadband operation through subwavelength grating dispersion engineering. Insertion losses below 1 dB and an extinction ratio higher than 20 dB are demonstrated through three-dimensional FDTD simulation in a 131-nm bandwidth. 2025-01-09T08:14:33Z 2025-01-09T08:14:33Z 2025-01-09T08:14:33Z 2019-06-01 journal article A. Herrero-Bermello, J. M. Luque-González, A. V. Velasco, A. Ortega-Moñux, P. Cheben and R. Halir, "Design of a Broadband Polarization Splitter Based on Anisotropy-Engineered Tilted Subwavelength Gratings," in IEEE Photonics Journal, vol. 11, no. 3, pp. 1-8, June 2019, Art no. 6601508, doi: 10.1109/JPHOT.2019.2912335 https://hdl.handle.net/10630/36021 10.1109/JPHOT.2019.2912335 eng open access IEEE Xplore