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Related Concept Videos

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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.
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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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Symmetry in Maxwell's Equations01:28

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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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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Information Metamaterial Systems.

Tie Jun Cui1, Lianlin Li2, Shuo Liu1

  • 1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.

Iscience
|August 11, 2020
PubMed
Summary
This summary is machine-generated.

Digital coding metamaterials enable dynamic control of electromagnetic waves, bridging the digital and physical worlds. This leads to advanced information metamaterials with diverse, real-time functionalities.

Keywords:
Electromagnetic WavesInformation SystemsMetamaterials

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Metamaterials offer unique electromagnetic wave control via subwavelength meta-atoms.
  • Passive metamaterials have fixed functions post-fabrication.
  • Active metamaterials integrate devices for dynamic control, but traditional types have limited tunability or reconfigurability.

Purpose of the Study:

  • To review the evolution of metamaterials.
  • To introduce the concepts and principles of digital coding and information metamaterials.
  • To discuss various information metamaterial systems and future trends.

Main Methods:

  • Review of existing literature on metamaterials, focusing on active, tunable, and reconfigurable types.
  • Explanation of digital coding principles applied to metamaterials.
  • Categorization and discussion of different information metamaterial systems.

Main Results:

  • Digital coding metamaterials, utilizing Field Programmable Gate Arrays (FPGAs), allow for a large number of distinct functionalities switchable in real-time.
  • Information metamaterials bridge the digital and physical realms, enabling direct digital information processing.
  • Various systems like programmable, software, intelligent, and space-time-coding metamaterials are presented.

Conclusions:

  • Digital coding and information metamaterials represent a significant advancement over traditional active metamaterials.
  • These novel metamaterials offer unprecedented flexibility and real-time control over electromagnetic waves.
  • The field of information metamaterials is rapidly progressing with promising future trends.