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Sub-wavelength grating components for integrated optics applications on SOI chips.

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    Silicon on insulator (SOI) sub-wavelength grating (SWG) optical components enable advanced integrated optics and sensing. These SWG devices, including bends, tapers, and couplers, offer compact designs and low losses for complex photonic circuits.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Nanophotonics

    Background:

    • Sub-wavelength gratings (SWG) offer unique light manipulation capabilities in integrated photonic circuits.
    • Silicon-on-insulator (SOI) platforms are a standard for integrated photonics, enabling high-density device fabrication.

    Purpose of the Study:

    • To demonstrate and characterize silicon on insulator (SOI) sub-wavelength grating (SWG) optical components for integrated optics and sensing applications.
    • To develop building blocks for complex optical devices using SWG technology with engineered optical properties.

    Main Methods:

    • Fabrication of SWG bends, tapers, and directional couplers on an SOI platform without top cladding.
    • Characterization of optical performance, including insertion loss, coupling length, and wavelength dependence for TE and TM polarizations.

    Main Results:

    • SWG tapers achieve insertion loss below 1 dB for connecting to strip waveguides.
    • SWG directional couplers exhibit compact designs with negligible wavelength dependence over a 40 nm bandwidth, enhancing bandwidth for TE modes.
    • SWG bends demonstrate losses between 0.8-1.6 dB per 90 degrees, with analyzed radius dependence.

    Conclusions:

    • SOI SWG components are viable building blocks for complex integrated optical devices like interferometers and switches.
    • The demonstrated SWG devices show potential for large-scale fabrication and the development of high-sensitivity sensors.
    • Engineered optical properties of SWG waveguides can be tailored for specific integrated photonics and sensing applications.