Correlation length and negative phase velocity in Isotropic dielectric-magnetic materials

Tom G. Mackay, Akhlesh Lakhtakia

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


A composite material comprising randomly distributed spherical particles of two different isotropic dielectric-magnetic materials is homogenized using the second-order strong-property-fluctuation theory in the long-wavelength approximation. Whereas neither of the two constituent materials by itself supports plane wave propagation with negative phase velocity (NPV), the homogenized composite material (HCM) can. The propensity of the HCM to support NPV propagation is sensitive to the distributional statistics of the constituent material particles, as characterized by a two-point covariance function and its associated correlation length. The scope for NPV propagation diminishes as the correlation length increases.

Original languageEnglish (US)
Article number063533
JournalJournal of Applied Physics
Issue number6
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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