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High-sensitivity polymer-based bimodal plasmonic refractive index sensors with polymer cladding.

Omkar Bhalerao, Stephan Suckow, Horst Windgassen

    Optics Express
    |August 13, 2025
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    Summary
    This summary is machine-generated.

    A new polymer cladding material enhances plasmonic refractive index sensors, achieving high sensitivity and a low limit of detection for environmental monitoring. This innovation improves bimodal plasmo-photonic sensing platforms.

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    Area of Science:

    • Photonics and Plasmonics
    • Materials Science
    • Sensor Technology

    Background:

    • Plasmonic refractive index sensors detect environmental changes via surface plasmon interactions.
    • Existing CMOS-compatible sensors are sensitive but complex; passive SU-8 waveguide sensors are simpler but lack isolation.
    • Current passive sensors have exposed waveguides, limiting their performance and application scope.

    Purpose of the Study:

    • To introduce a novel polymer cladding material (SX AR LWL 2.0) for bimodal plasmonic sensors.
    • To enhance the performance of SU-8 based plasmo-photonic waveguides.
    • To improve opto-mechanical isolation and sensitivity in plasmonic refractive index sensors.

    Main Methods:

    • Development of a new polymer cladding material (SX AR LWL 2.0) compatible with SU-8 waveguides.
    • Fabrication of bimodal plasmonic sensors using an aluminum plasmonic stripe and a bilayer SU-8 photonic waveguide core cladded with SX AR LWL 2.0.
    • Characterization of sensor performance in aqueous solutions to determine sensitivity and limit of detection.

    Main Results:

    • The developed sensors achieved a high sensitivity of (6108 ± 13) nm/RIU.
    • A limit of detection of 1.6 × 10-7 RIU was recorded in aqueous solutions.
    • The new cladding material demonstrated superior performance compared to traditional and other polymer-based bimodal plasmo-photonic sensors.

    Conclusions:

    • The SX AR LWL 2.0 polymer cladding material significantly enhances bimodal plasmonic refractive index sensors.
    • This advancement offers a more efficient and integrated sensing platform with improved sensitivity and detection limits.
    • The new material paves the way for broader applications of plasmonic sensing technologies.