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相关概念视频

Radiation: Applications01:17

Radiation: Applications

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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.
The average...
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Dual Nature of Electromagnetic (EM) Radiation01:10

Dual Nature of Electromagnetic (EM) Radiation

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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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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:
727

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相关实验视频

Updated: Jun 29, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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多光谱伪装和辐射冷却使用动态调节的超表面.

Guoqing Zhou, Jing Huang, Haowen Li

    Optics express
    |April 4, 2024
    PubMed
    概括

    这项研究引入了一个可调节的超表面,用于先进的多光谱伪装和辐射冷却. 这种新的设计有效地减少了热辐射和光检测和距离 (LiDAR) 信号,提高了隐私和热管理.

    科学领域:

    • 材料科学 材料科学 材料科学
    • 光学是什么?光学是什么?光学是什么?
    • 纳米技术纳米技术

    背景情况:

    • 越来越多的隐私需求需要先进的伪装技术.
    • 现有的使用元表面的多谱伪装解决方案在单个设备功能和模式限制方面存在局限性.

    研究的目的:

    • 提出和演示一个动态调节的超表面,用于集成的多光谱伪装和辐射冷却.
    • 为了克服以前用于伪装应用的超表面设计的局限性.

    主要方法:

    • 制造出一种由黄金 (Au),化 (Sb2Se3) 和 (Al) 组成的新型超表面.
    • 在Sb2Se3的无形和晶体阶段表现的超表面的表征.

    主要成果:

    • 在中波红外 (MWIR) 范围使用无形Sb2Se3实现了98.2%的热辐射减少率.
    • 在1064nm光检测和射程 (LiDAR) 中,证明了96.3%的回声信号减速率.
    • 在Sb2Se3的晶体阶段观察到的最大冷却功率为65.5Wm-2,使得高效的红外伪装成为可能.

    结论:

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  • 开发的超表面有效地整合了辐射冷却,LiDAR信号减弱和红外伪装功能.
  • 这种可调节的超表面为下一代隐私和热管理设备提供了多功能策略.