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Standing Electromagnetic Waves01:15

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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.
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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 medium, μ.
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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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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.
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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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Scattering And Absorption of Light in Planetary Regoliths
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Computación adjunta física in situ en entornos de dispersión múltiple electromagnética para el control de ondas

John Guillamon1, Cheng-Zhen Wang1, Zin Lin2

  • 1Wave Transport in Complex Systems Lab, Department of Physics, Wesleyan University, Middletown, CT, USA.

Nature communications
|December 13, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores controlan ondas electromagnéticas en sistemas de dispersión complejos utilizando optimización adjunta (AO). Este método permite la manipulación de ondas en tiempo real para aplicaciones como comunicaciones inalámbricas e imágenes avanzadas.

Palabras clave:
optimización adjuntacontrol de ondasdispersión múltipleelectromagnetismocomunicaciones inalámbricasimágenes

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Área de la Ciencia:

  • Física
  • Electromagnetismo
  • Propagación de ondas

Sus antecedentes:

  • El control de las ondas electromagnéticas en sistemas de dispersión múltiple es complejo debido a la interferencia de múltiples trayectorias.
  • Este desafío es significativo para aplicaciones en comunicaciones inalámbricas, imágenes y micromanipulaciones ópticas.

Objetivo del estudio:

  • Demostrar el control en tiempo real de la propagación de ondas electromagnéticas en entornos de dispersión complejos.
  • Aprovechar la optimización adjunta (AO) para manipular el comportamiento de las ondas en sistemas de múltiples trayectorias.

Principales métodos:

  • Se utilizaron metodologías de optimización adjunta (AO) eficientes en tiempo y energía.
  • Se explotó la naturaleza de múltiples trayectorias de los entornos de dispersión para amplificar las variaciones del sistema informadas por AO.

Principales resultados:

  • Se lograron funcionalidades de ondas en tiempo real impulsadas por ondas, que incluyen emisión de canales dirigida, absorción perfecta coherente y camuflaje.
  • Se demostró que las pequeñas variaciones locales del sistema se amplifican mediante la dispersión repetida de ondas.

Conclusiones:

  • La optimización adjunta ofrece un cambio de paradigma para controlar ondas en sistemas de dispersión complejos.
  • El enfoque es aplicable a tecnologías inalámbricas de interior y a varios marcos basados en ondas, como redes neuronales de imágenes y ópticas.