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1. Broadband Polarization Beam Splitter Rotator Using Only Silicon Nitride

   Ghaedi_Vanani, Fatemeh; Fardoost, Alireza; Li, Guifang; Doerr, Christopher (March 2024, IEEE)

   We designed and fabricated a CMOS-compatible polarization beam splitter and rotator purely in Si 3 N 4 , achieving experimentally an insertion loss of ~1.5dB and a polarization extinction ratio greater than 15dB from 1280 to 1320nm. 

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2. Integrated visible-light polarization rotators and splitters for atomic quantum systems

   https://doi.org/10.1364/OL.509747  

   Hattori, Ashton; Sneh, Tal; Notaros, Milica; Corsetti, Sabrina; Callahan, Patrick_T; Kharas, Dave; Mahony, Thomas; McConnell, Robert; Chiaverini, John; Notaros, Jelena (March 2024, Optics Letters)

   In this work, we design and experimentally demonstrate the first, to the best of our knowledge, integrated polarization splitters and rotators at blue wavelengths. We develop compact and efficient designs for both a polarization splitter and rotator at a 422-nm wavelength, an important laser-cooling transition for⁸⁸Sr⁺ions. These devices are fabricated in a 200-mm wafer-scale process and experimentally demonstrated, resulting in a measured polarization-splitter transverse-electric thru-port coupling of 98.0% and transverse-magnetic tap-port coupling of 77.6% for a compact 16-µm-long device and a polarization-rotator conversion efficiency of 92.2% for a separate compact 111-µm-long device. This work paves the way for more sophisticated integrated control of trapped-ion and neutral-atom quantum systems. 

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3. InP-based polarization rotator-splitter for mid-infrared photonic integration circuits

   https://doi.org/10.1063/1.5055863  

   Chung, Chi-Jui; Midkiff, Jason; Yoo, Kyoung_Min; Rostamian, Ali; Guo, Joel; Chen, Ray_T; Chakravarty, Swapnajit (January 2019, AIP Advances)

   We design and experimentally demonstrate the propagation loss of waveguides and the operation of a single-step etched polarization rotator-splitter (PRS) in low index contrast InGaAs-InP material system at 6.15 μm. Propagation losses 4.19 dB/cm for TM mode and 3.25 dB/cm for TE mode are measured. The designed PRS can achieve near 100% conversion efficiency. This study enables the possibility of monolithic integration of quantum cascade devices with TM-polarized characteristics and TE-guiding two-dimensional slotted photonic crystal waveguide gas sensors for on-chip monolithic absorption spectroscopy. 

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4. Polarization rotator for shear elastic waves

   https://doi.org/10.1063/5.0090261  

   Jin, Yuqi; Yang, Teng; Choi, Tae-Youl; Dahotre, Narendra B.; Neogi, Arup; Krokhin, Arkadii (July 2022, Applied Physics Letters)

   We designed and characterized a 3D printed acoustic shear wave polarization rotator (PR) based on the specific nature of the fused-deposition-modeling printing process. The principle of the PR is based on rotation of the polarization axis of a shear wave due to the gradual change in orientation of the axis of anisotropy along the direction of wave propagation of a printed layered structure. The component of the shear modulus parallel to the infilled lines within each layer is significantly higher than that in the perpendicular direction. As the PR was printing, a small angle between neighboring layers was introduced, resulting in a 3D helicoidal pattern of distribution of the axes of anisotropy. The polarization of the propagating shear wave follows this pattern leading to the rotation of the polarization axis by a desirable angle. The total rotation angle can be tuned by the number of printed layers. The fabricated [Formula: see text] rotators demonstrate high performance that can be improved by changing the infill fraction settings. 

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5. Design of an X-cut thin-film lithium niobate waveguide as a passive polarization rotator

   https://doi.org/10.1364/OE.445412  

   Cortes-Herrera, Luis; He, Xiaotong; Cardenas, Jaime; Agrawal, Govind_P (December 2021, Optics Express)

   The transverse-electric and transverse-magnetic modes of an X-cut thin-film lithium niobate waveguide vary in effective indices and exchange power when the waveguide makes an oblique angle with its crystallographic Z-axis, i.e. its optics axis. We leverage this phenomenon to design a passive fundamental-mode polarization rotator. In our design, the lithium niobate waveguide is tilted at an optimum angle with respect to its Z-axis, such that material anisotropy induces phase-matched polarization conversion. We discuss the rotator’s ideal-device length, crosstalk, and bandwidth. The proposed design yields compact (shorter than 1 mm), low-loss, passive polarization rotators for telecom wavelengths. 

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