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Related Experiment Video

Updated: Feb 19, 2026

Implementation of a Reference Interferometer for Nanodetection
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Tunable compact nanosensor based on Fano resonance in a plasmonic waveguide system.

Xiaobin Ren, Kun Ren, Yuanxue Cai

    Applied Optics
    |November 2, 2017
    PubMed
    Summary

    This study introduces an ultracompact plasmonic refractive index sensor utilizing Fano resonance. The sensor demonstrates high sensitivity and a figure of merit, with tunable properties for enhanced performance.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Optical Sensing

    Background:

    • Fano resonance in plasmonic structures offers sharp spectral features suitable for sensing applications.
    • Metal-insulator-metal waveguides coupled with split-ring resonators are promising for creating compact optical devices.

    Purpose of the Study:

    • To propose and analyze an ultracompact plasmonic refractive index sensor based on Fano resonance.
    • To investigate the influence of structural parameters on Fano resonance and refractive index sensitivity.
    • To explore the potential for dual Fano resonance effects.

    Main Methods:

    • Numerical simulations of a metal-insulator-metal waveguide with a stub and a side-coupled split-ring resonator.
    • Analysis of transmission spectra to study Fano resonance characteristics.

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  • Investigation of field patterns to understand resonance mechanisms.

    • Main Results:

    • Achieved high refractive index sensitivity (> 1.4×10³ nm/RIU) and figure of merit (1.2×10⁵).
    • Demonstrated tunability of peak wavelength and lineshape by altering structural parameters.
    • Observed dual Fano resonance effects due to symmetry breaking.

    Conclusions:

    • The proposed sensor design enables efficient and tunable refractive index sensing.
    • Optimization of geometric parameters can further enhance sensor performance.
    • The study provides insights into the design of advanced plasmonic sensors.