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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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High-performance broadband electromagnetic interference shielding optical window based on a metamaterial absorber.

Yaqiang Zhang, Hongxing Dong, Nanli Mou

    Optics Express
    |September 10, 2020
    PubMed
    Summary

    A transparent metamaterial window shields electromagnetic interference (EMI) with over 90% absorption from 7.8-18.0 GHz. This broadband shielding window maintains high optical transmittance, ideal for advanced electronic displays.

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    Area of Science:

    • Metamaterials
    • Electromagnetic Interference (EMI) Shielding
    • Optical Metamaterials

    Background:

    • Metamaterials offer unique electromagnetic properties.
    • Transparent EMI shielding solutions are crucial for electronic devices.
    • Broadband absorption and high optical transmittance are challenging to achieve simultaneously.

    Purpose of the Study:

    • To theoretically propose and experimentally demonstrate a transparent metamaterial-based EMI shielding window.
    • To achieve broadband absorption and high optical transmittance.
    • To investigate the absorption mechanism and angular/polarization independence.

    Main Methods:

    • Fabrication of a metamaterial window using double split circular ring (SCR) elements.
    • Incorporation of Indium-tin-oxide (ITO) with resonant patterns for enhanced ohmic loss.
    • Experimental characterization of absorption, shielding effectiveness (SE), and optical transmittance.
    • Analysis using an equivalent circuit model and electromagnetic field/current distribution studies.

    Main Results:

    • Achieved >90% absorption over an ultrawide frequency range of 7.8-18.0 GHz.
    • Measured shielding effectiveness (SE) > 18.25 dB from 7.0-18.0 GHz.
    • Maintained an average optical transmittance of ~73.10% in the visible-near-infrared (400-1,500 nm) region.
    • Demonstrated insensitivity to incident angle and polarization.

    Conclusions:

    • The proposed metamaterial window effectively combines broadband EMI shielding with high optical transparency.
    • The design utilizing ITO-patterned SCR elements is a viable approach for advanced shielding applications.
    • The device shows significant potential for displays in military and medical precision devices.