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Embedded racetrack microring resonator sensor based on GeSbSe glasses.

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    This study presents a novel chalcogenide glass biosensor using a compact racetrack double microring resonator (MRR). The device achieves high sensitivity and a low limit of detection for glucose sensing applications.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nanotechnology

    Background:

    • Microring resonators (MRRs) are crucial for optical sensing.
    • Chalcogenide glasses offer unique optical properties for device fabrication.
    • Developing compact and sensitive biosensors is essential for diagnostics.

    Purpose of the Study:

    • To investigate a compact racetrack double microring resonator (MRR) sensor.
    • To utilize Ge28Sb12Se60 (GeSbSe) chalcogenide glass for biosensing.
    • To evaluate the sensor's performance in detecting glucose concentrations.

    Main Methods:

    • Fabrication of the double MRR sensor using electron beam lithography (EBL) and dry etching.
    • Characterization of the device's optical properties via transmission spectrum analysis.
    • Assessment of sensor sensitivity and limit of detection using varying glucose solutions.

    Main Results:

    • Achieved a high Q-factor of 7.17 × 10^4 and Free Spectral Range (FSR) of 24 nm.
    • Demonstrated a sensitivity of 297 nm/RIU for glucose detection.
    • Obtained an intrinsic limit of detection (iLOD) of 7.40 × 10^-5.

    Conclusions:

    • The compact racetrack double MRR sensor based on GeSbSe glass shows excellent performance.
    • This technology holds promise for advanced biosensing applications.
    • Chalcogenide glasses are viable materials for future biosensor development.