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Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

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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Standing Electromagnetic Waves01:15

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Updated: Jun 26, 2026

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

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Broadband ground-plane cloak.

R Liu1, C Ji, J J Mock

  • 1Center for Metamaterials and Integrated Plasmonics, Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA.

Science (New York, N.Y.)
|January 20, 2009
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate a novel cloaking device using transformation optics and metamaterials to hide objects from electromagnetic waves. This ground-plane cloak operates across a broad bandwidth with low loss, suggesting potential for optical applications.

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
10:35

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Area of Science:

  • Electromagnetism and Metamaterials
  • Transformation Optics
  • Applied Physics

Background:

  • Cloaking objects from electromagnetic wave detection is a significant area of research.
  • Transformation optics provides a theoretical framework for designing cloaking devices by manipulating spacetime metrics.
  • Metamaterials offer the ability to engineer electromagnetic properties not found in nature.

Purpose of the Study:

  • To experimentally realize a cloak design capable of concealing a perturbation on a flat conducting plane.
  • To demonstrate a ground-plane cloak that hides objects from electromagnetic detection.
  • To investigate the feasibility of cloaking at microwave frequencies using metamaterials.

Main Methods:

  • Applied transformation optics to Maxwell's equations to derive required constitutive parameters.
  • Constructed a metamaterial cloak composed of thousands of precisely designed elements using an automated process.
  • Utilized nonresonant metamaterial elements for broad operational bandwidth and low loss.

Main Results:

  • Successfully demonstrated a ground-plane cloak that conceals a perturbation on a conducting surface.
  • Achieved a broad operational bandwidth from 13 to 16 gigahertz.
  • Observed extremely low loss in the metamaterial cloak structure.

Conclusions:

  • The experimental realization validates the transformation optics approach for cloaking.
  • The developed ground-plane cloak exhibits promising characteristics for practical applications.
  • The results suggest that this cloaking technology can be scaled towards optical wavelengths.