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Biosensor based on two-dimensional gradient guided-mode resonance filter.

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    |March 17, 2021
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    Summary
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    A novel two-dimensional gradient (TDG) biosensor enhances detection range and resolution. This guided-mode resonance (GMR) filter technology enables sensitive, label-free biomolecule detection and smartphone integration.

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    Area of Science:

    • Photonics and Sensor Technology
    • Nanotechnology
    • Biomedical Engineering

    Background:

    • Guided-mode resonance (GMR) sensors offer high sensitivity for detecting refractive index changes.
    • Traditional GMR sensors often face limitations in simultaneously achieving broad detection range and high resolution.
    • Developing compact, versatile biosensing platforms is crucial for advanced diagnostics.

    Purpose of the Study:

    • To introduce a novel two-dimensional gradient (TDG) GMR biosensor.
    • To demonstrate the combined benefits of gradient grating period (GGP) and gradient waveguide thickness (GWT) for enhanced sensing capabilities.
    • To validate the sensor's performance in label-free biomolecule detection.

    Main Methods:

    • Fabrication of a TDG-GMR filter with distinct GGP and GWT dimensions.
    • Characterization of the sensor's performance using sucrose solutions to determine detection range and limit of detection.
    • Experimental demonstration of label-free (LF) detection of albumin using the TDG-GMR biosensor.

    Main Results:

    • The TDG-GMR biosensor achieved a broad detection range of 0.109 RIU (0%-60% sucrose) and a limit of detection of 5.62 × 10-4.
    • The GGP-GMR component provided a broad detection range, while the GWT-GMR component offered high resolution.
    • Successful label-free detection of albumin was demonstrated, confirming the sensor's utility for biomolecule analysis.

    Conclusions:

    • The TDG-GMR biosensor uniquely combines broad detection range and high resolution in a single compact device.
    • This technology enables sensitive, label-free biomolecule detection with potential for multiplex measurements.
    • The proposed biosensor is compatible with simple readout systems and can be integrated with portable devices like smartphones.