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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Published on: December 27, 2012

Electromagnetic wave interactions with a metamaterial cloak.

Hongsheng Chen1, Bae-Ian Wu, Baile Zhang

  • 1The Electromagnetics Academy at Zhejiang University, Zhejiang University, Hangzhou 310058, China. chenhs@ewt.mit.edu

Physical Review Letters
|October 13, 2007
PubMed
Summary

This study analyzes electromagnetic wave interactions with spherical cloaks. Ideal cloaks offer zero scattering, while lossy cloaks can achieve invisibility using monostatic detection.

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Area of Science:

  • Electromagnetic theory
  • Metamaterial cloaking
  • Wave scattering

Background:

  • Metamaterial cloaks aim to control electromagnetic wave propagation.
  • Understanding scattering properties is crucial for cloak performance.

Purpose of the Study:

  • To analytically investigate electromagnetic wave interactions with spherical cloaks.
  • To determine the scattering characteristics of ideal and lossy cloaks.
  • To assess the impact of cloak imperfections on detection.

Main Methods:

  • Full wave Mie scattering model
  • Analytical derivation of scattering cross-sections
  • Analysis of monostatic and bistatic scattering

Main Results:

  • Ideal cloaks exhibit zero total scattering.
  • Lossy cloaks demonstrate zero backscattering, enabling monostatic invisibility.
  • Bistatic scattering is more sensitive to the impedance parameter (eta) than the refractive index (n).

Conclusions:

  • Spherical cloaks can achieve invisibility under specific conditions.
  • Loss mechanisms and parameter imperfections significantly influence cloaking effectiveness.
  • The impedance parameter is critical for bistatic cloaking performance.