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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Transparency induced by coupled resonances in disordered metamaterials.

Wei Tan1, Yong Sun, Zhi-Guo Wang

  • 1Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, P. R. China.

Optics Express
|January 7, 2010
PubMed
Summary

We demonstrate a method to achieve transparency in disordered metamaterial multilayers. This involves balancing growing and decaying waves to enable complete tunneling, confirmed by microwave experiments.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electromagnetism

Background:

  • Disordered multilayers with negative permittivity and negative permeability exhibit complex wave transport.
  • Achieving transparency, or complete transmission, in such systems is challenging due to wave decay and scattering.

Purpose of the Study:

  • To propose and verify a scheme for inducing transparency in one-dimensional disordered metamaterial multilayers.
  • To analytically derive the conditions for complete tunneling in multiple-resonance systems.
  • To experimentally validate the proposed transparency scheme.

Main Methods:

  • Derivation of analytical expressions for the transparency condition.
  • Development of a compensating method to balance wave propagation.
  • Microwave simulations and experimental measurements to confirm theoretical predictions.

Main Results:

  • Analytical conditions for transparency were derived, highlighting the need for exponentially growing waves to compensate for decaying waves.
  • A compensating method successfully induced transparency in the disordered metamaterial multilayers.
  • Experimental results in the microwave regime validated the theoretical analysis and proposed scheme.

Conclusions:

  • Transparency can be achieved in disordered negative-index metamaterial multilayers by carefully controlling wave propagation.
  • The coupling of resonances significantly influences the transport properties of these metamaterials.
  • The findings offer insights into controlling wave phenomena in complex disordered systems.