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Effective medium theory for Kapitza stratified media: diffractionless propagation.

Carlo Rizza1, Alessandro Ciattoni2

  • 1Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Via Valleggio 11, 22100 Como, Italy and Consiglio Nazionale delle Ricerche, CNR-SPIN, 67100 Coppito L'Aquila, Italy.

Physical Review Letters
|August 29, 2014
PubMed
Summary
This summary is machine-generated.

A new regime of diffractionless electromagnetic propagation is achieved using a Kapitza medium with rapidly modulated dielectric permittivity. This robust phenomenon occurs under specific conditions and is not significantly hindered by medium losses.

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Area of Science:

  • Electromagnetism
  • Materials Science
  • Wave Propagation

Background:

  • Electromagnetic wave propagation is typically subject to diffraction.
  • Dielectric permittivity modulation can influence wave behavior.

Purpose of the Study:

  • To investigate a novel regime of diffractionless electromagnetic propagation.
  • To explore the conditions and feasibility of this propagation regime.

Main Methods:

  • Theoretical analysis of electromagnetic propagation in a Kapitza medium.
  • Analytical investigation of a metal-dielectric layered medium.

Main Results:

  • A robust regime of diffractionless propagation was identified.
  • The regime requires specific ratios of dielectric profile and modulation parameters.
  • Standard effective medium theory is insufficient for this regime.
  • Medium losses do not significantly impede the phenomenon.

Conclusions:

  • Diffractionless electromagnetic propagation is achievable in modulated dielectric media.
  • The proposed regime offers a robust and feasible method for controlling wave propagation.