Time-Reversal for Electromagnetic Waves in Complex Media

Abstract

A time-reversal mirror is, roughly speaking, a device which is capable of receiving an acoustic signal in time, keeping it in memory and sending it back into the medium in the reversed direction of time. In this paper, we employ an accurate numerical method for simulating waves propagating in complex one-dimensional media. We use numerical simulations to reproduce the time-reversal self-averaging effect which takes place in randomly layered media. This is done in the regime where the inhomogeneities are smaller than the pulse, which propagates over long distances compared to its width. We show numerical evidence for possible use of an expanding window time-reversal technique for detecting anomalies buried in the medium.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2003
Accession Number
ADA421538

Entities

People

  • Jean-pierre Fouque
  • Mansoor A. Haider

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Signals
  • Acoustics
  • Buried Objects
  • Detection
  • Electromagnetic Scattering
  • Equations
  • Frequency
  • Frequency Domain
  • Integral Equations
  • Linear Systems
  • Photonic Crystals
  • Probability
  • Probability Distributions
  • Pulse Amplitude
  • Simulations
  • Time Domain
  • Two Dimensional

Fields of Study

  • Engineering
  • Physics

Readers

  • Acoustical Oceanography.
  • Educational Psychology
  • Wave Propagation and Nonlinear Chaotic Dynamics.