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Fano resonance based on D-shaped waveguide structure and its application for human hemoglobin detection.

Xing Liu, Jina Li, Jianfeng Chen

    Applied Optics
    |August 5, 2020
    PubMed
    Summary

    This study introduces a novel metal-insulator-metal waveguide structure that exhibits Fano resonance for high-sensitivity biosensing. The proposed device demonstrates excellent sensitivity and tunability for applications like human hemoglobin detection.

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    Area of Science:

    • Photonics and Nanophotonics
    • Plasmonics
    • Sensing Technologies

    Background:

    • Fano resonance is a key phenomenon in photonics, enabling applications like high-sensitivity sensing and electromagnetic-induced transparency.
    • Metal-insulator-metal (MIM) waveguide structures offer a versatile platform for manipulating light at the nanoscale.

    Purpose of the Study:

    • To propose and analyze a novel MIM waveguide structure for achieving Fano resonance.
    • To investigate the tunability of Fano resonance by altering geometric parameters and refractive index.
    • To demonstrate the potential of the structure for high-sensitivity biosensing applications.

    Main Methods:

    • Utilized the finite element method (FEM) for detailed analysis of transmission characteristics and magnetic-field distributions.
    • Designed a MIM waveguide structure with a D-shaped cavity and a silver-air-silver barrier.
    • Simulated Fano resonance and its dependence on structural and environmental parameters.

    Main Results:

    • Achieved Fano resonance through the interaction between the D-shaped cavity and the bus waveguide.
    • Demonstrated tunability of Fano resonance by adjusting geometric parameters and the refractive index of the D-shaped cavity.
    • Obtained a maximum refractive index sensitivity of 1510 nm/RIU with a linear relationship between resonance wavelength and refractive index.

    Conclusions:

    • The proposed MIM waveguide structure effectively exhibits tunable Fano resonance.
    • The structure shows high sensitivity and linearity, making it suitable for refractive index sensing.
    • The study highlights the potential of this plasmonic sensor for bio-sensing, including human hemoglobin and blood group detection.