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    A novel composite guided-mode resonant (GMR) filter avoids multi-mode effects. This structure expands the tunable wavelength range for practical GMR filter applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Guided-mode resonant (GMR) filters are crucial optical components.
    • Existing GMR filters can suffer from multi-mode resonance effects, limiting performance.
    • Expanding the resonant wavelength tuning range is essential for advanced applications.

    Purpose of the Study:

    • To propose a non-homogeneous composite GMR filter structure.
    • To overcome multi-mode resonance and enhance wavelength tuning range.
    • To demonstrate a practical fabrication method for advanced GMR filters.

    Main Methods:

    • Fabrication of a composite structure using varied-line-spacing (VLS) grating and a wedge-shaped waveguide layer.
    • Utilizing holographic interference lithography (IL) for grating fabrication.
    • Employing masked ion beam etching (MIBE) for the wedge-shaped waveguide layer.
    • Design and analysis using rigorous coupled-wave analysis (RCWA).

    Main Results:

    • Demonstrated a non-homogeneous GMR filter structure with spatial variation in grating period and waveguide thickness.
    • Achieved a primary reflectance peak spanning a broad wavelength range of 805.8-1119.0 nm.
    • Observed resonant wavelength variation as a function of spatial position, confirming tunability.

    Conclusions:

    • The proposed non-homogeneous composite GMR filter effectively avoids multi-mode resonance.
    • The engineered structure significantly increases the resonant wavelength tuning range.
    • The fabrication techniques are suitable for practical GMR filter applications.