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相关概念视频

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 number of...
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Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Electromagnetic Waves01:30

Electromagnetic Waves

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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Clipper Circuit01:18

Clipper Circuit

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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
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相关实验视频

Updated: Jan 8, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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电磁波控制的双功能极化-选择性元格化.

Jianjia Yi, Ruimeng Zhang, Jiahui Ji

    Optics express
    |December 19, 2025
    PubMed
    概括

    这项研究引入了一种能够对x和y极化电磁波进行偏振-选择性吸收和能量分配的新型超聚变反射器. 该设计显示了对x偏振的高吸收率和对y偏振的受控能量分布,经过实验结果验证.

    科学领域:

    • 电磁学 电磁学 电磁学 电磁学
    • 超材料是指一种超材料.
    • 光学是什么?光学是什么?光学是什么?

    背景情况:

    • 超级分层通过抑制衍射,使控制的电磁波传播成为可能.
    • 现有的元分级通常只适用于单个极化状态.

    研究的目的:

    • 为两个直角线性极化提出和演示一个新的元格反射器设计,具有不同的功能.
    • 通过使用优化的元原子来实现偏振选择性吸收和能量分配.

    主要方法:

    • 利用粒子群优化来确定极化选择性控制的最佳阻抗密度.
    • 设计和利用能够独立实现对直角偏振的参数的元原子.
    • 制造并通过实验验证了一种原型的元格反射器.

    主要成果:

    • 在x极化波的最大吸收率为99.2%.
    • 在y极化波的衍射顺序中,证明了大约1:1:1的能量分布比.
    • 实验结果证实了模拟的偏振选择性吸收和反射特性.

    结论:

    • 拟议的超级分层设计成功地展示了极化选择性吸收和能量分配.

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  • 这项工作为极化束分离器,秘密通信和电磁兼容性等应用提供了基础.
  • 展示的功能突出了定制元原子设计的潜力,用于先进的电磁波操纵.