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Analytical Solution for the Stopping Power of the Cherenkov Radiation in a Uniaxial Nanowire Material

Morgado, T. A. ; Fernandes, D. E. ; Silveirinha, M. G.

Photonics Vol. 2, Nº 2, pp. 702 - 718, June, 2015.

ISSN (print): 2304-6732
ISSN (online): 2304-6732

Journal Impact Factor: 3,179 (in 2015)

Digital Object Identifier: 10.3390/photonics2020702

Abstract
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 charge 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 the presence of material dispersion, the optimal charge velocity that maximizes the emitted Cherenkov power may be less than the speed of light in a vacuum.