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Related Concept Videos

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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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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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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Electric potential can be pictorially represented as a three-dimensional surface. On such a surface, the electric potential is constant everywhere. The equipotential surface is always perpendicular to the electric field lines, and while it is three-dimensional, it can be treated as an equipotential line in a two-dimensional case. These equipotential lines are also always perpendicular to electric field lines. The term equipotential is often used as a noun, referring to an equipotential line or...
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The concept of flux describes how much of something goes through a given area. More formally, it is the dot product of a vector field within an area. For a better understanding, consider an open rectangular surface with a small area that is placed in a uniform electric field. The larger the area, the more field lines go through it and, hence, the greater the flux; similarly, the stronger the electric field (represented by a greater density of lines), the greater the flux. On the other hand, if...
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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Metasurfaces for general transformations of electromagnetic fields.

S A Tretyakov1

  • 1Department of Radio Science and Engineering, Aalto University, Aalto 00076, Finland sergei.tretyakov@aalto.fi.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|July 29, 2015
PubMed
Summary
This summary is machine-generated.

This review explores electrically thin composite layers, known as metasurfaces, for manipulating electromagnetic fields. It covers their functionalities and future research directions in applied electromagnetics.

Keywords:
metasurfacereflectiontransmission

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Electrically thin composite layers offer novel ways to control electromagnetic fields.
  • Metasurfaces provide a versatile platform for advanced electromagnetic applications.

Purpose of the Study:

  • To review the historical development and classification of metasurfaces.
  • To provide an overview of the functionalities of linear metasurfaces.
  • To discuss future research directions in the field.

Main Methods:

  • Literature review of metasurface research.
  • Classification of metasurfaces based on design principles.
  • Analysis of electromagnetic field manipulation capabilities.

Main Results:

  • Metasurfaces enable precise control over electromagnetic wave properties.
  • A general classification of linear metasurfaces is presented.
  • Various functionalities achievable with metasurfaces are discussed.

Conclusions:

  • Metasurfaces are a key technology for future electromagnetic applications.
  • Continued research is needed to unlock the full potential of metasurfaces.
  • The review provides a foundation for further exploration of metasurface functionalities.