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    A new photonic sensor design uses a single-channel bimodal interferometer with subwavelength gratings. This sensor achieves high sensitivity for detecting changes in refractive index, confirmed by theoretical and simulation analyses.

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    Area of Science:

    • Photonics
    • Nanotechnology
    • Optical Sensing

    Background:

    • Interferometry is a key technique in optical sensing.
    • Subwavelength gratings (SWGs) offer unique optical properties for device design.

    Purpose of the Study:

    • To propose a novel photonic sensor configuration.
    • To investigate the sensing performance of a single-channel bimodal interferometer with SWG.

    Main Methods:

    • Theoretical modeling of dispersion relations for bimodal periodic structures.
    • Finite-Difference Time Domain (FDTD) analysis for simulation.

    Main Results:

    • Achieved a theoretical bulk sensitivity of approximately 1300 nm/RIU.
    • Obtained a theoretical surface sensitivity of approximately 6.1 nm/nm.
    • FDTD simulations confirmed theoretical sensitivity calculations.

    Conclusions:

    • The proposed bimodal interferometer with SWG is a promising platform for high-sensitivity photonic sensing.
    • The design demonstrates excellent agreement between theoretical predictions and numerical simulations.
    • This configuration offers potential for advanced optical sensing applications.