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Electromagnetic Waves in Matter01:30

Electromagnetic Waves in Matter

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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Dual Nature of Electromagnetic (EM) Radiation01:10

Dual Nature of Electromagnetic (EM) Radiation

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Magnetic Damping01:17

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Diamagnetism01:26

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Electromagnetic Waves01:30

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Los metamateriales de la memoria

T Driscoll1, Hyun-Tak Kim, Byung-Gyu Chae

  • 1Department of Physics, University of California at San Diego (UCSD), La Jolla, CA 92093, USA. tdriscol@physics.ucsd.edu

Science (New York, N.Y.)
|August 22, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron metamateriales ágiles a la frecuencia con capacidades de afinación persistentes. Este avance permite cambios duraderos en las respuestas metamateriales utilizando estímulos transitorios, que interactúan con dispositivos de memoria.

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Área de la Ciencia:

  • Metamateriales Ciencia Ciencia de los Metamateriales
  • Física de la materia condensada Física de la materia condensada
  • Ingeniería Eléctrica Ingeniería Eléctrica.

Sus antecedentes:

  • Los metamateriales poseen propiedades únicas debido a los elementos resonantes, pero están limitados por estrechos anchos de banda de frecuencia utilizables.
  • Los metamateriales ágiles a la frecuencia ofrecen sintonización en tiempo real para superar las limitaciones de ancho de banda.
  • Se necesitan mecanismos de ajuste persistentes para un control estable y a largo plazo de las propiedades de los metamateriales.

Objetivo del estudio:

  • Para demostrar el ajuste de frecuencia persistente controlado eléctricamente en metamateriales.
  • Para explorar la integración de los metamateriales con los conceptos de dispositivos de memoria.
  • Para superar las limitaciones de ancho de banda inherentes a los metamateriales tradicionales.

Principales métodos:

  • Fabricación de metamateriales con elementos de resonancia electricamente sintonizables.
  • Aplicación de estímulos eléctricos transitorios para la sintonización.
  • Caracterización de la respuesta de frecuencia del metamaterial antes y después de los estímulos.
  • Demostración de la retención de estado persistente.

Principales resultados:

  • Se logró la sintonización de frecuencia persistente de la respuesta del metamaterial a través del control eléctrico.
  • Se ha demostrado que el efecto de afinación se mantiene después de que se elimina el estímulo.
  • Mostró una forma de capacidad de memoria dentro del sistema metamaterial.

Conclusiones:

  • El ajuste de frecuencia persistente controlado eléctricamente es posible en los metamateriales.
  • Esta tecnología permite modificaciones duraderas en las propiedades de los metamateriales.
  • El sistema desarrollado interactúa metamateriales con dispositivos de memoria, abriendo nuevas vías de aplicación.