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Related Concept Videos

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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Plane Electromagnetic Waves I01:30

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Electromagnetic Wave Equation01:24

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Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
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Standing Electromagnetic Waves01:15

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Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

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.
Dual Nature of Electromagnetic (EM) Radiation01:10

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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).
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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

Metamaterials at zero frequency.

B Wood1, J B Pendry

  • 1Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2AZ, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 19, 2012
PubMed
Summary
This summary is machine-generated.

Designing metamaterial structures for low frequencies is challenging. We present a superconducting metamaterial design enabling diamagnetism for a direct current (DC) magnetic cloak.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Electromagnetism

Background:

  • Metamaterial design for low-frequency operation presents significant challenges.
  • Achieving variable, anisotropic magnetic permeability, including diamagnetic properties, is crucial for applications like magnetic cloaking.

Purpose of the Study:

  • To investigate the design of metamaterial structures for very low-frequency operation.
  • To address the specific requirements of a direct current (DC) magnetic cloak, particularly the need for tunable anisotropic magnetic permeability.

Main Methods:

  • Theoretical investigation of metamaterial properties at low frequencies.
  • Exploration of superconducting components to achieve necessary magnetic properties.
  • Development of a specific metamaterial design incorporating these components.

Main Results:

  • Demonstrated that superconducting components are essential for achieving diamagnetism at low frequencies.
  • Presented a novel metamaterial design that fulfills the stringent magnetic permeability requirements for a DC magnetic cloak.
  • The proposed design exhibits the necessary variable and anisotropic magnetic permeability.

Conclusions:

  • Superconducting metamaterials offer a viable pathway for achieving low-frequency magnetic cloaking.
  • The presented design provides a practical solution for creating devices with specific, tunable magnetic responses at very low frequencies.
  • This work advances the field of metamaterials for specialized electromagnetic applications.