Broad bandwidth waveguide polarizer via grating mediated mode conversion

Zheng, Jun and Ye, Zhi-Cheng and Wang, Cheng-Liang and Fu, Yi-Fei and Sheng, Zheng-Ming (2019) Broad bandwidth waveguide polarizer via grating mediated mode conversion. Journal of Optical Society of America B, 36 (6). pp. 1602-1606. ISSN 0740-3224 (https://doi.org/10.1364/JOSAB.36.001602)

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Abstract

A polarization beam splitter (PBS) based on a four-layer slab waveguide is proposed, where a sub-wavelength grating is embedded between the waveguide core and the cladding. This grating not only affords Bragg momentum to tune the propagation constant of guiding modes but also converts the forward zero-order waveguide mode to the backward first one for a specific polarization. Thus, the incident light with polarization that satisfies the phase-matching condition is highly reflected in the waveguide, while other light with orthogonal polarization keeps intact and passes through it efficiently. Numerical simulations show that one can make the compact PBS for both polarizations with an extinction ratio higher than 35 dB, a waveband larger than 80 nm, a grating period tolerance of 20 nm, and a waveguide height tolerance of 80 nm. The revealed mode conversion mechanism via the sub-wavelength grating enriches the design of PBSs for integrated silicon waveguide chips.

  • Item type:Article
    ID code:68129
    Dates:
    Date
    Event
    22 May 2019
    Published
    2 May 2019
    Accepted
    Notes:© 2019 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:30 May 2019 09:13
    Last modified:09 Apr 2024 00:42
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/68129
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