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High quality factor electromagnetically induced transparency-like effect in coupled guided-mode resonant systems.

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    We demonstrate a novel dielectric coupled guided-mode resonant (GMR) system exhibiting electromagnetically induced transparency (EIT)-like effects. This system offers a narrow transparency window and flexible wavelength design for highly sensitive sensors.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Nanotechnology

    Background:

    • Guided-mode resonant (GMR) systems offer unique optical properties.
    • Coupling GMR modes can lead to complex spectral behaviors.
    • Electromagnetically induced transparency (EIT) is a quantum interference phenomenon with potential applications.

    Purpose of the Study:

    • To numerically investigate a dielectric coupled GMR system.
    • To explore the occurrence of EIT-like spectral responses.
    • To assess the potential for high-sensitivity sensing applications.

    Main Methods:

    • Numerical simulation of a dielectric coupled GMR system.
    • Utilizing two silicon (Si) grating waveguide layers (GWLs) on CaF2 substrates.
    • Introducing a Fabry-Perot (F-P) resonator to induce mode coupling.

    Main Results:

    • Confirmed coupling between top and bottom GMR modes upon F-P resonator introduction.
    • Observed EIT-like spectral responses in the coupled GMR system.
    • Demonstrated a narrow transparency window with a high-quality (Q) factor EIT-like effect (up to 288,892).
    • Showed flexible design of EIT-like response wavelengths across a wide range.

    Conclusions:

    • The coupled GMR system exhibits significant EIT-like effects.
    • The demonstrated high-Q factor EIT-like response is tunable.
    • This system holds promise for developing novel, ultra-sensitive sensors.