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Dual Nature of Electromagnetic (EM) Radiation01:10

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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).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the...
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Related Experiment Video

Updated: May 5, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Multi-angle absorption-scattering metagrating architecture for high-efficiency electromagnetic wave dissipation.

Jinchao Hu, Yao Ying, Jie Zhang

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    This study introduces a novel metagrating that simultaneously controls electromagnetic wave absorption and scattering. The device suppresses reflections and achieves high absorption efficiency across multiple angles and directions.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetic Wave Manipulation
    • Advanced Materials Science

    Background:

    • Conventional metasurfaces face limitations in achieving simultaneous broadband absorption and multidirectional scattering control.
    • Multifunctional integration is a growing demand in advanced electromagnetic manipulation devices.

    Purpose of the Study:

    • To propose a novel absorption-scattering integrated multi-layer metagrating.
    • To demonstrate control over electromagnetic wave scattering and absorption, suppressing large-angle reflections and enabling beam averaging.

    Main Methods:

    • Design and fabrication of a multi-layer metagrating structure.
    • Utilized a lossy high-conductivity carbon powder composite polyurethane film.
    • Experimental validation of absorption and scattering characteristics under various incident conditions.

    Main Results:

    • Achieved 96.8% electromagnetic wave absorption at the operating frequency.
    • Demonstrated >98% absorption efficiency for incident waves from five different directions (±70°, ±30°, 0°).
    • Successfully averaged and controlled wavenumbers to other channels, enabling effective scattering direction and amplitude control.

    Conclusions:

    • The developed metagrating effectively integrates absorption and scattering functionalities.
    • The method offers precise control over electromagnetic wave propagation, paving the way for applications in beam manipulation, stealth, and electromagnetic shielding.