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Causality, Nonlocality, and Negative Refraction.

Davide Forcella1, Claire Prada1, Rémi Carminati1

  • 1ESPCI Paris, PSL Research University, CNRS, Institut Langevin, 1 rue Jussieu, F-75005 Paris, France.

Physical Review Letters
|April 15, 2017
PubMed
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Negative refraction in electromagnetic materials requires both dissipation and spatial nonlocality. This theory provides a fundamental understanding for analyzing electromagnetic and other wave phenomena.

Area of Science:

  • Electromagnetism
  • Wave phenomena

Background:

  • Recent studies highlight the significance of spatial nonlocality in describing negative refraction.
  • Negative refraction is a phenomenon where light bends in the opposite direction than usual.

Purpose of the Study:

  • To develop a first-principles theory of negative refraction in homogeneous and isotropic media.
  • To incorporate spatial nonlocality in its full generality into the theoretical framework.

Main Methods:

  • Development of a first-principles theoretical model.
  • Inclusion of spatial nonlocality and dissipation as key parameters.

Main Results:

  • Demonstrated that both dissipation and spatial nonlocality are necessary for negative refraction.

Related Experiment Videos

  • Established a sufficient condition for negative refraction in materials with weak spatial nonlocality.

    • Conclusions:

    • Spatial nonlocality and dissipation are fundamental requirements for negative refraction.
    • The developed theory offers broad implications for analyzing electromagnetic and other wave propagations.