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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Plasmonic external cavity laser refractometric sensor.

Meng Zhang, Meng Lu, Chun Ge

    Optics Express
    |October 17, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel plasmonic external cavity laser (ECL) for highly sensitive refractometric sensing. This sensor achieves a record figure of merit, enabling precise detection of refractive index changes for biosensing applications.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Engineering
    • Materials Science

    Background:

    • Surface plasmon resonance (SPR) offers high sensitivity for refractive index sensing.
    • External cavity lasers (ECLs) provide narrow spectral linewidths.
    • Integrating SPR with lasers can enhance biosensing performance.

    Purpose of the Study:

    • To demonstrate a plasmonic external cavity laser (ECL) for high-resolution refractometric sensing.
    • To combine the sensitivity of SPR with the narrow linewidth of an ECL.
    • To achieve an improved figure of merit for optical biosensing.

    Main Methods:

    • Utilized a plasmonic crystal with extraordinary optical transmission (EOT) as the wavelength-selective element in an ECL.
    • Achieved single-mode lasing at the EOT resonance peak.
    • Demonstrated electrically-pumped, continuous-wave operation.

    Main Results:

    • The plasmonic ECL sensor maintained high sensitivity and narrow spectral linewidth.
    • Achieved a record high figure of merit for refractometric sensing.
    • Demonstrated a detection limit of 1.79 × 10⁻⁶ refractive index units (RIU).

    Conclusions:

    • The plasmonic ECL is a promising platform for label-free optical biosensing.
    • This approach enhances signal-to-noise ratios for applications like drug discovery and pathogen sensing.
    • The integrated system offers superior performance compared to traditional refractometric sensors.