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相关概念视频

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
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Wave Parameters01:10

Wave Parameters

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed...
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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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相关实验视频

Updated: Jul 1, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

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复杂的广度可编程的多功能超表面平台,由引导波驱动.

Jian-Qiao Han1, Fan-Yi Meng1, Chunsheng Guan2

  • 1Department of Microwave Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 14, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种薄型,可编程的超表面,由引导波提供动力,消除了重的外部源. 它展示了对振幅和相位的动态控制,用于先进的电磁波操纵.

关键词:
艾瑞光束 (Aryy Beam) 是一个复杂的幅度调制复杂的幅度调制.导向波驱动的地表变化器.低侧叶水平光束扫描低侧叶水平光束扫描

更多相关视频

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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相关实验视频

Last Updated: Jul 1, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

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科学领域:

  • 电磁学 电磁学 电磁学 电磁学
  • 材料科学 材料科学 材料科学
  • 波浪工程 波浪工程

背景情况:

  • 超表面提供了对电磁波 (EM) 的特殊控制,但通常需要外部空间养,阻碍了实际应用.
  • 现有的超表面设计往往面临着整合和重的电力输送系统的挑战.

研究的目的:

  • 提出和演示一种低调的可编程超表面,能够同时动态控制振幅和相位.
  • 为了克服传统地表系统中外部料来源的局限性.

主要方法:

  • 一种具有0.05λ0厚度的新型超表面设计,由基板集成波导体内的引导波驱动.
  • 在每个元原子内集成p-i-n二极管,用于1位振幅切换 (辐射/非辐射) 和1位相位切换 (0°/180°).

主要成果:

  • 实现了对振幅和相位的同时动态控制.
  • 使用单个平台在远场中低侧叶水平光束扫描和在近场中使用Airy光束生成的演示.
  • 在没有外部空间料源或复杂的功率分隔器的情况下成功运行.

结论:

  • 拟议的引导波养,可编程的超表面为先进的EM波控制提供了一个低调的解决方案.
  • 这项技术克服了整合的挑战,并为更自由的复杂幅度EM波操纵开辟了新的可能性.