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    Researchers developed a transparent electromagnetic-wave-absorbing optical window (EAOWRG) for multimode detection systems. This innovative window offers excellent optical transparency and electromagnetic shielding, meeting stringent compatibility requirements.

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    Area of Science:

    • Materials Science
    • Electromagnetics
    • Optics

    Background:

    • Multimode detection systems require precise control over electromagnetic characteristics and compatibility.
    • Existing solutions may compromise optical transparency for electromagnetic shielding or vice versa.

    Purpose of the Study:

    • To design and manufacture a transparent electromagnetic-wave-absorbing optical window (EAOWRG) for multimode detection systems.
    • To evaluate the optical transparency, electromagnetic wave absorption, and shielding performance of the developed EAOWRG.

    Main Methods:

    • Fabrication of an optical window using a random grid metasurface structure.
    • Characterization of optical transmissivity in visible and infrared spectra.
    • Measurement of electromagnetic reflectivity and shielding effectiveness across various frequency bands.
    • Assessment of radar cross-section reduction in a detection system.

    Main Results:

    • The EAOWRG exhibits over 89.77% transmissivity in the 460-800 nm and 8-12 µm spectral ranges.
    • Electromagnetic reflectivity is below -5 dB in the 3.6-7.2 GHz and 14.3-17.7 GHz ranges, with a bandwidth of 4.4 GHz below -10 dB.
    • Electromagnetic shielding effectiveness exceeds 31 dB from 2-18 GHz.
    • Radar cross-section was reduced by an average of 8.79 dB at 6 GHz within a ±60° angle domain.

    Conclusions:

    • The developed EAOWRG effectively balances multispectral optical transparency with robust electromagnetic wave absorption and shielding.
    • The EAOWRG meets the stringent electromagnetic characteristic control and compatibility requirements for multimode detection systems.
    • The technology shows significant promise for applications requiring both clear optical imaging and electromagnetic interference mitigation.