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相关概念视频

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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Electromagnetic Waves in Matter01:30

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Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
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Plane Electromagnetic Waves II01:29

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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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Energy Carried By Electromagnetic Waves01:22

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Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
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Plane Electromagnetic Waves I01:30

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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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Updated: Jun 5, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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采用可编程编码元地表面的全息通信.

Fan Zhang1, Chaohui Wang1, Weike Feng1

  • 1Air and Missile Defense College, Air Force Engineering University, Xi'an 710051, China.

Nanophotonics (Berlin, Germany)
|December 16, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种新的全息通信策略,即将光学信息实时转换为电磁信号. 这种自适应电磁技术可以为先进的近场通信应用程序实现动态波纹操纵.

关键词:
全息通信是全息通信.接近现场的通信.可编程编码的地表转移.旋转脱的旋转脱

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 超材料是什么?超材料是什么?
  • 无线通信无线通信

背景情况:

  • 基于地表的全息通信提供了自适应电磁功能.
  • 传统的被动元表面缺乏实时重新配置,以进行波面操纵.

研究的目的:

  • 提出和演示一种新的全息通信策略,用于实时将光学信息转换为电磁信息.
  • 在自适应电磁应用中克服被动元表面的局限性.

主要方法:

  • 使用深度摄像头和YOLOv5s算法获取和编码信息.
  • 数据传输通过软件定义的无线电模块在5 GHz (长期演变).
  • 使用可编程编码12GHz的超表面和修改的Gerchberg-Saxton算法进行全息图像重建.

主要成果:

  • 成功证明了光学信息转换为电磁信息的概念.
  • 通过智能全息通信方案实现的实时波纹操纵.
  • 基于自适应电场模式的近场通信潜力的验证.

结论:

  • 拟议的战略通过将光学数据转换为动态电磁信号,使按需全息通信成为可能.
  • 这种方法推进了自适应电磁功能和实时波浪控制.
  • 开辟了使用可编程元表面和智能算法进行近场通信的新途径.