Autor(es): Morgado, Tiago A. ; Fernandes, David E. ; Silveirinha, Mário
Data: 2015
Identificador Persistente: https://hdl.handle.net/10316/109245
Origem: Estudo Geral - Universidade de Coimbra
Assunto(s): Cherenkov radiation; wire medium; metamaterials
This article was published in Photonics 2015, 2(2), 702-718
We derive closed analytical formulae for the power emitted by moving charged particles in a uniaxial wire medium by means of an eigenfunction expansion. Our analytical expressions demonstrate that in the absence of material dispersion the stopping power of the uniaxial wire medium is proportional to the charges velocity, and that there is no velocity threshold for the Cherenkov emission. It is shown that the eigenfunction expansion formalism can be extended to the case of dispersive lossless media. Furthermore, in presence of material dispersion the optimal charge velocity that maximizes the emitted Cherenkov power may be less than the speed of light in vacuum.
