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Low-cost optical cavity based sensor with a large dynamic range.

D Rho, S Kim

    Optics Express
    |August 10, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A novel three-laser system enhances optical cavity biosensors for point-of-care diagnostics. This improved biosensor design offers a larger dynamic range and greater fabrication tolerance compared to previous two-laser systems.

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    Area of Science:

    • Biomedical Engineering
    • Optical Sensing
    • Point-of-Care Diagnostics

    Background:

    • Optical cavity biosensors offer potential for sensitive refractive index measurements.
    • Previous differential detection methods using two lasers showed promise but suffered from limited dynamic range and tight fabrication tolerances.

    Purpose of the Study:

    • To introduce and experimentally validate a three-laser system for optical cavity biosensors.
    • To improve dynamic range and fabrication tolerance for more robust point-of-care diagnostic devices.

    Main Methods:

    • Design, fabrication, and measurement of an optical cavity structure.
    • Implementation of a chained differential detection method using three lasers at different wavelengths.
    • Comparative analysis of responsivity, dynamic range, and repeatability against a two-laser system.

    Main Results:

    • The three-laser system demonstrated a significantly larger dynamic range, exceeding that of the two-laser system by over three times.
    • Differential detection with three wavelengths yielded higher responsivity to refractive index changes compared to single wavelengths.
    • Repeatability tests confirmed a substantially larger fabrication tolerance for the three-laser system due to its expanded dynamic range.

    Conclusions:

    • A three-laser optical cavity biosensor with chained differential detection offers enhanced performance for point-of-care applications.
    • The proposed system overcomes limitations of previous designs by providing a larger dynamic range and improved fabrication tolerance.