Propagation of EM Waves in metamaterials

AI Thread Summary
Metamaterials with negative effective permittivity and permeability exhibit unique wave propagation characteristics. When the product of permittivity and permeability is negative, the wave equation results in a purely imaginary wave number. This condition suggests the possibility of complete attenuation of the wave. A review linked in the discussion provides insights into negative refractive index materials, which may clarify these phenomena. Understanding these principles is crucial for advancing applications in optics and telecommunications.
Vaibhav Sahu
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We have materials that have negative effective permittivity and permeability. In such materials, when the product of permittivity and permeability is negative, solving the wave equation yields a wave with a purely imaginary wave number. Does this mean complete attenuation of the wave ?
 
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Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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