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Sidewall grating slot waveguide microring resonator biochemical sensor.

Weiqing Cheng, Xiao Sun, Shengwei Ye

    Optics Letters
    |September 29, 2023
    PubMed
    Summary

    This study introduces a novel sidewall grating slot microring resonator (SG-SMRR) on a silicon-on-insulator platform. The compact SG-SMRR sensor achieves high refractive index sensitivity and an expanded detection range without free spectral range limitations.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Integrated Optics
    • Silicon Photonics

    Background:

    • Silicon-on-insulator (SOI) platforms enable high-performance on-chip sensing.
    • Microring resonators are key components for integrated sensing applications.
    • Existing sensors face limitations in detection range and sensitivity.

    Purpose of the Study:

    • To propose and experimentally demonstrate a novel sidewall grating slot microring resonator (SG-SMRR).
    • To achieve a compact sensor size with enhanced performance metrics.
    • To overcome the free spectral range (FSR) limitation in microring resonator sensors.

    Main Methods:

    • Fabrication of a compact SG-SMRR with a 5 µm center radius on an SOI platform.
    • Experimental characterization of refractive index (RI) sensitivity and limit of detection (LOD).
    • Evaluation of concentration sensitivity, minimum concentration detection limit, and Q-factor.

    Main Results:

    • Achieved RI sensitivity of 620 nm/RIU and LOD of 1.4 × 10⁻⁴ RIU.
    • Demonstrated concentration sensitivity of 1120 pm/% and a minimum detection limit of 0.05%.
    • The sidewall grating design eliminated FSR limitations, enabling an 84.5 nm detection range, four times that of conventional microring resonators.

    Conclusions:

    • The novel SG-SMRR offers a significant advancement in on-chip sensing capabilities.
    • Its compact size, high sensitivity, and large measurement range are ideal for demanding applications.
    • This silicon photonics sensor paves the way for next-generation integrated sensing solutions.