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Integrated multichannel Young's interferometer sensor based on long-range surface plasmon waveguides.

Wei Ru Wong, Pierre Berini

    Optics Express
    |September 13, 2019
    PubMed
    Summary
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    Integrated Young

    Area of Science:

    • Plasmonics and Nanophotonics
    • Integrated Optics
    • Biomedical Sensors

    Background:

    • Long-range surface plasmon polariton (LRSPP) waveguides offer unique light confinement properties.
    • Young's interferometers (YI) are sensitive optical sensing platforms.
    • Existing LRSPP sensors often rely on less sensitive attenuation-based detection.

    Purpose of the Study:

    • To develop and demonstrate novel integrated Young's interferometer (YI) sensors utilizing LRSPP waveguides.
    • To enable simultaneous, phase-based refractive index monitoring in multi-channel configurations.
    • To improve upon the detection limits of existing LRSPP-based sensing technologies.

    Main Methods:

    • Fabrication of single-channel and multi-channel YI sensors based on LRSPP waveguides.

    Related Experiment Videos

  • Utilizing Y-junction splitters and corporate feed structures for beam splitting.
  • Interference pattern generation in the far field and post-processing with the Fast Fourier Transform (FFT) algorithm for phase extraction.
  • Demonstration of sensing capability via sequential injection of solutions with varying refractive indices.

    • Main Results:

    • Achieved a detection limit of approximately 1 x 10^-6 Refractive Index Units (RIU) for both sensor types.
    • Demonstrated simultaneous and independent phase-based monitoring in the multi-channel YI.
    • Showcased significant improvement in sensitivity compared to attenuation-based LRSPP sensing methods.

    Conclusions:

    • Integrated LRSPP-based YI sensors offer a highly sensitive platform for refractive index sensing.
    • The multi-channel YI design enables parallelized, high-resolution optical sensing.
    • Phase-based detection in LRSPP YIs significantly enhances sensing performance over attenuation-based approaches.