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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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All-polymer photonic crystal slab sensor.

Pétur G Hermannsson, Kristian T Sørensen, Christoph Vannahme

    Optics Express
    |July 21, 2015
    PubMed
    Summary

    This study introduces a novel all-polymer photonic crystal slab sensor for refractive index sensing. The sensor achieves high sensitivity and a low detection limit, making it suitable for biological applications.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Photonic crystal sensors offer high sensitivity for detecting changes in refractive index.
    • Developing cost-effective and label-free sensing platforms is crucial for widespread biological applications.

    Purpose of the Study:

    • To develop and characterize an all-polymer photonic crystal slab sensor for sensitive refractive index (RI) detection.
    • To demonstrate the sensor's suitability for single-use biological and RI sensing applications.

    Main Methods:

    • Fabrication of a two-layer polymer slab using UV nanoreplication and spin-casting.
    • Modification of the upper layer with ZrO2-based nanoparticles for enhanced sensing.
    • Characterization of resonant reflection properties and sensitivity using a spectrometer.

    Main Results:

    • The sensor exhibited narrow resonant reflection with a Full Width at Half Maximum (FWHM) < 1 nm.
    • A high sensitivity of 31 nm/RIU was achieved for media with refractive indices near water.
    • A detection limit of 4.5 × 10⁻⁶ RIU was demonstrated with a 12 pm/pixel spectrometer.

    Conclusions:

    • The all-polymer photonic crystal slab sensor provides a cost-effective and highly sensitive platform for refractive index sensing.
    • The vacuum-less fabrication method makes it ideal for disposable, single-use sensing applications.
    • The demonstrated performance indicates potential for label-free biosensing and environmental monitoring.