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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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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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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Related Experiment Video

Updated: Jun 25, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Multiband Omnidirectional Invisibility Cloak.

Xiaojun Hu1, Yu Luo2, Jie Wang3

  • 1Laboratory of Applied Research on Electromagnetics, Zhejiang University, Hangzhou, 310027, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|May 21, 2024
PubMed
Summary

Researchers developed a new design for transformation optics (TO) devices, creating an invisibility cloak that works at multiple frequencies. This breakthrough overcomes the narrow bandwidth limitation of previous cloaks, enabling practical applications.

Keywords:
Fabry‐Pérot resonancemultibandnonmagneticomnidirectional invisibility cloak

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Area of Science:

  • Physics
  • Materials Science
  • Electromagnetism

Background:

  • Transformation optics (TO) enables electromagnetic wave manipulation for applications like invisibility cloaks.
  • Current invisibility cloaks suffer from narrow bandwidth, limiting practical use.
  • Multiband operation is crucial for advancing TO devices.

Purpose of the Study:

  • To propose a general design strategy for multiband anisotropic metamaterials.
  • To experimentally implement an omnidirectional invisibility cloak with multiband capabilities.
  • To overcome the single-frequency limitation of existing TO devices.

Main Methods:

  • Designed anisotropic metamaterials with infinite and spatially gradient permittivity components.
  • Utilized transformation optics principles to combine metamaterials for cloak fabrication.
  • Conducted far-field simulations and near-field experimental mappings for validation.

Main Results:

  • Successfully implemented an omnidirectional invisibility cloak.
  • Achieved impedance matching to free space at multiple frequencies.
  • Demonstrated simultaneous scattering suppression of multiple large objects at 5 and 10 GHz.

Conclusions:

  • The proposed design strategy enables multiband anisotropic metamaterials.
  • The experimental realization of a multiband invisibility cloak is a significant advancement.
  • This work brings practical multiband transformation optical devices closer to reality.