Electromagnetic Energy Density in Dispersive and Dissipative Media | NIST

  title={Electromagnetic Energy Density in Dispersive and Dissipative Media | NIST},
  author={Frederico Dias Nunes and Thiago Campos Vasconcelos and Marcel Bezerra and John Weiner},
The description of the energy density associated with an electromagnetic field propagating through matter must treat two different phenomena: dispersion, the variation of the refractive index with frequency, and dissipation, the loss of field energy by absorption. In many cases, as in common dielectrics, the dispersive medium is essentially transparent, so dissipation can be neglected. For metals, however, both dispersion and dissipation must be taken into account, and their respective… CONTINUE READING


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