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Subwavelength grating filtering devices.

Junjia Wang, Ivan Glesk, Lawrence R Chen

    Optics Express
    |July 1, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We developed novel optical filters using subwavelength gratings (SWG) in silicon-on-insulator (SOI). These SWG Bragg gratings and ring resonators demonstrate high performance, paving the way for advanced photonic devices.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Subwavelength gratings (SWG) offer unique optical properties.
    • Silicon-on-insulator (SOI) is a key platform for integrated photonics.

    Purpose of the Study:

    • To propose and simulate optical filters based on SWG.
    • To demonstrate the feasibility of SWG Bragg gratings and ring resonators in SOI.
    • To experimentally verify the performance of SWG ring resonators.

    Main Methods:

    • Numerical simulations (e.g., finite-difference time-domain) were used to characterize SWG Bragg gratings.
    • SWG ring resonators were designed, fabricated, and tested.
    • Experimental measurements focused on extinction ratio and Q-factor.

    Main Results:

    • Feasibility of SWG Bragg gratings in SOI demonstrated via simulation.
    • SWG ring resonators verified through simulation and experiment.
    • Fabricated devices achieved extinction ratios up to 30 dB and Q-factors around 20,000.

    Conclusions:

    • Subwavelength gratings are effective for creating high-performance optical filters on SOI.
    • SWG filters serve as foundational elements for complex integrated photonic circuits.
    • The demonstrated devices show potential for various photonic applications.