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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Functional lasing microcapillaries for surface-specific sensing.

Z Zhang, W Morrish, K Gardner

    Optics Express
    |November 2, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a microcapillary-based lasing sensor for sensitive material detection. The sensor tracks lasing mode shifts, achieving a 9.75 nM detection limit for microspheres, outperforming fluorescent devices.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Chemical Sensing

    Background:

    • Lasing sensors offer superior intensity and linewidth over fluorescent devices.
    • Microcapillary structures provide a robust platform for optical sensing applications.

    Purpose of the Study:

    • To demonstrate a microcapillary-based lasing sensor sensitive to surface binding.
    • To evaluate the sensor's performance for detecting specific materials like polystyrene microspheres.

    Main Methods:

    • Utilized lasing into "star" and "triangle" modes of a microcapillary.
    • Monitored lasing mode shifts after polyelectrolyte tri-layer deposition and microsphere binding.
    • Employed layer-by-layer surface binding analysis.

    Main Results:

    • Successfully tracked lasing mode spectrum changes with surface layer deposition.
    • Achieved a detection limit of 9.75 nM for carboxy-functionalized polystyrene microspheres.
    • Demonstrated favorable comparison with fluorescence-based detection methods.

    Conclusions:

    • Microcapillary microlasers offer a robust and sensitive platform for stable, lasing-based detection.
    • The presented methods are adaptable for various surface binding schemes and lasing wavelengths.
    • This technology holds potential for diverse applications requiring precise optical sensing.