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Related Concept Videos

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Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Dual-spectrum transparent random encoding metasurface for scattering reduction and electromagnetic shielding.

Tianhao Liu, Yelong Wang, Feng Qi

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    |February 20, 2026
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    A novel dual-spectrum transparent random encoding metasurface (DTREM) offers combined radar cross-section reduction and electromagnetic protection for optical windows. This technology enhances visible and infrared transmittance while providing significant shielding and stealth capabilities.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetic Compatibility
    • Optical Engineering

    Background:

    • Advanced optical windows require simultaneous high transmittance and electromagnetic (EM) protection.
    • Existing solutions often compromise performance in one or more spectral ranges or EM shielding effectiveness.
    • Metasurfaces offer tunable electromagnetic properties for novel device functionalities.

    Purpose of the Study:

    • To propose and demonstrate a dual-spectrum transparent random encoding metasurface (DTREM).
    • To achieve excellent radar cross-section (RCS) reduction and enhanced EM protection for optical windows.
    • To ensure high EM shielding and transmittance in visible and infrared spectra.

    Main Methods:

    • Fabrication of a DTREM using an easy-to-implement metal mesh technology.
    • Theoretical analysis of physical parameter constraints for the metal mesh.
    • Optimization of the coding array using a simulated annealing algorithm.
    • Experimental validation of transmittance, RCS reduction, and EM shielding effectiveness.

    Main Results:

    • Achieved dual-spectrum transmittance of 89.5% at 550 nm and 90.8% in the 3.0-5.0 μm range.
    • Demonstrated RCS reduction exceeding 10 dB across 13.6-17.2 GHz.
    • Obtained a shielding effectiveness of 23.8 dB over the X-Ku band.

    Conclusions:

    • The developed DTREM effectively integrates high optical transmittance with robust EM protection and stealth capabilities.
    • The simulated annealing algorithm significantly improved RCS reduction performance.
    • The proposed metasurface is a promising solution for integrated optoelectronic detection platforms.