Inverse design engineering of all-silicon polarization beam splitters

Lars Hagedorn Frandsen, Ole Sigmund

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    Abstract

    Utilizing the inverse design engineering method of topology optimization, we have realized high-performing all-silicon ultra-compact polarization beam splitters. We show that the device footprint of the polarization beam splitter can be as compact as similar to 2 µm2 while performing experimentally with a polarization splitting loss lower than similar to 0.82 dB and an extinction ratio larger than similar to 15 dB in the C-band. We investigate the device performance as a function of the device length and find a lower length above which the performance only increases incrementally. Imposing a minimum feature size constraint in the optimization is shown to affect the performance negatively and reveals the necessity for light to scatter on a sub-wavelength scale to obtain functionalities in compact photonic devices.
    Original languageEnglish
    Title of host publicationProceedings of SPIE : Photonic and Phononic Properties of Engineered Nanostructures VI
    EditorsAli Adibi, Shawn-Yu Lin, Axel Scherer
    Number of pages6
    Volume9756
    PublisherSPIE - International Society for Optical Engineering
    Publication date2016
    Article number97560Y
    ISBN (Electronic)9781628419917
    DOIs
    Publication statusPublished - 2016
    EventPhotonic and Phononic Properties of Engineered Nanostructures VI - The Moscone Cente, San Francisco, United States
    Duration: 15 Feb 201618 Feb 2016
    Conference number: 6
    https://spie.org/PW16O/conferencedetails/photonic-and-phononic-properties-of-engineered-nanostructures

    Conference

    ConferencePhotonic and Phononic Properties of Engineered Nanostructures VI
    Number6
    LocationThe Moscone Cente
    Country/TerritoryUnited States
    CitySan Francisco
    Period15/02/201618/02/2016
    Internet address
    SeriesProceedings of SPIE - The International Society for Optical Engineering
    ISSN0277-786X

    Keywords

    • Silicon photonics
    • Inverse design engineering
    • Topology optimization
    • Polarization beam splitter

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