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Related Concept Videos

Radiation: Applications01:17

Radiation: Applications

1.1K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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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).
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Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Multispectral camouflage and radiative cooling using dynamically tunable metasurface.

Guoqing Zhou, Jing Huang, Haowen Li

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    This study introduces a tunable metasurface for advanced multispectral camouflage and radiative cooling. The novel design effectively reduces thermal radiation and light detection and ranging (LiDAR) signals, enhancing privacy and thermal management.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Growing demand for privacy necessitates advanced camouflage technologies.
    • Existing multispectral camouflage solutions using metasurfaces have limitations in single-device functionality and mode restrictions.

    Purpose of the Study:

    • To propose and demonstrate a dynamically tunable metasurface for integrated multispectral camouflage and radiative cooling.
    • To overcome the limitations of previous metasurface designs for camouflage applications.

    Main Methods:

    • Fabrication of a novel metasurface composed of gold (Au), antimony selenide (Sb2Se3), and aluminum (Al).
    • Characterization of the metasurface's performance in amorphous and crystalline phases of Sb2Se3.

    Main Results:

    • Achieved a 98.2% thermal radiation reduction rate in the mid-wave infrared (MWIR) range using amorphous Sb2Se3.
    • Demonstrated a 96.3% echo signal reduction rate for 1064 nm light detection and ranging (LiDAR).
    • Observed a maximum cooling power of 65.5 Wm-2 in the crystalline phase of Sb2Se3, enabling efficient infrared camouflage.

    Conclusions:

    • The developed metasurface effectively integrates radiative cooling, LiDAR signal reduction, and infrared camouflage capabilities.
    • This tunable metasurface offers a versatile strategy for next-generation privacy and thermal management devices.