Spatial dispersion and negative refraction of light
By V. Agranovich, Y. Gartstein. 2006
204 citations recorded by the source corpus.
Negative refraction occurs at interfaces as a natural consequence of the negative group velocity of waves in one of the interfacing media. The historical origin of this understanding of the phenomenon is briefly discussed. We consider several physical systems that may exhibit normal electromagnetic waves (polaritons) with negative group velocity at optical frequencies. These systems are analyzed in a unified way provided by the spatial dispersion framework. The framework utilizes the notion of the generalized dielectric tensor εij(ω, k) representing the electromagnetic response of the medium to perturbations of frequency ω and wave vector k. Polaritons with negative group velocity can exist in media (whether in natural or in artificial meta-materials) with a sufficiently strong spatial dispersion. Our examples include both gyrotropic and nongyrotropic systems, and bulk and surface polariton waves. We also discuss the relation between the spatial dispersion approach and the more familiar, but more restricted, description involving the dielectric permittivity ε(ω) and the magnetic permeability μ(ω) .
Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/5ddd2516c5681a9e72c05e58610c66c06845db72
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In Atomic and Molecular Physics, and Optics
In Biomedical Engineering
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Bianisotropic Photonic Metamaterials (2010, background): “Provided the displacement current is negligible [27] (which is usually fulfilled in the vicinity of the resonance), we can identify the macroscopic magnetization with the magnetic dipole density M discussed above.”