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High-performance optical sensing based on electromagnetically induced transparency-like effect in Tamm plasmon

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    We developed a novel optical sensor using an electromagnetically induced transparency (EIT)-like effect in a Tamm plasmon structure. This sensor achieves ultrahigh sensitivity for applications in gas, biochemical, and optofluidic sensing.

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    Area of Science:

    • Photonics and Nanotechnology
    • Optical Sensing
    • Plasmonics

    Background:

    • Electromagnetically induced transparency (EIT) is a quantum interference effect in atomic systems.
    • Tamm plasmons are surface electromagnetic waves supported by a metal-dielectric multilayer structure.
    • Existing optical sensors often face limitations in sensitivity and figure of merit.

    Purpose of the Study:

    • To present a novel optical sensor based on an EIT-like effect in a Tamm plasmon multilayer structure.
    • To investigate the origin of the EIT-like phenomenon in the proposed structure.
    • To demonstrate ultrahigh sensing performance for practical applications.

    Main Methods:

    • Fabrication of a multilayer structure consisting of a metal film, dielectric Bragg grating (TiO2/SiO2 layers), and a defect layer.
    • Utilizing the coupling and destructive interference between defect and Tamm plasmon modes.
    • Numerical simulations and theoretical calculations to validate experimental observations.

    Main Results:

    • Observation of an EIT-like effect in the Tamm plasmon multilayer structure, characterized by an ultranarrow refractive-index-sensitive peak.
    • Achieved ultrahigh sensing sensitivity of 416 nm/RIU and a figure of merit (FOM) of 682 RIU⁻¹.
    • Demonstrated significant enhancement of the dimensionless FOM (up to 2.4×10⁴) by tailoring the defect layer thickness.

    Conclusions:

    • The developed EIT-like effect in Tamm plasmon structures enables ultrasensitive optical sensing.
    • The proposed sensor design offers tunable spectral characteristics for optimized performance.
    • This work opens new avenues for advanced optical sensors in various fields, including gas, biochemical, and optofluidic sensing.