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Low-diffraction EMI-shielding multiband optical window based on randomized metallic mesh.

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    This summary is machine-generated.

    This study introduces an optimized, randomized metallic mesh optical window that significantly reduces diffraction and improves electromagnetic interference (EMI) shielding. The innovative design enhances optical performance for electro-optical systems in high-radiation environments.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Electromagnetics

    Background:

    • Optical windows are vital for electro-optical systems, but electromagnetic interference (EMI) poses a performance challenge.
    • Traditional metallic mesh windows offer EMI shielding and transmittance but suffer from diffraction, degrading image quality.
    • Existing random structures improve diffraction but lack comprehensive optimization.

    Purpose of the Study:

    • To develop an innovative, multiband optical window with enhanced EMI shielding and optical performance.
    • To overcome the limitations of conventional periodic and random metallic mesh structures.
    • To reduce diffraction effects and improve spectral transmittance through a novel optimization process.

    Main Methods:

    • Employed a novel optimization process for a multiband optical window design.
    • Utilized a randomized metallic mesh structure to minimize higher-order diffraction.
    • Integrated a 9-layer ZnS/YbF3 antireflection coating for multiband performance.

    Main Results:

    • Reduced higher-order diffraction optical energy by 74% compared to periodic meshes.
    • Achieved EMI shielding effectiveness exceeding 20 dB in the 12-18 GHz frequency band.
    • Attained average optical transmittance of 86.1% (0.4-0.7µm), 89.8% (1.064µm), and 81.1% (3-5µm).

    Conclusions:

    • The proposed multiband optical window effectively mitigates diffraction and enhances EMI shielding.
    • The optimized randomized mesh design offers superior performance over traditional metallic meshes.
    • This innovative window design is expected to significantly improve the application and effectiveness of EMI shielding in optical systems.