Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-03-15
Eur.Phys.J.D 13, 289 (2001)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
17 pages, 6 figures
Scientific paper
10.1007/s100530170278
A theory is presented for the frequency dependence of the power spectrum of photon current fluctuations originating from a disordered medium. Both the cases of an absorbing medium (``grey body'') and of an amplifying medium (``random laser'') are considered in a waveguide geometry. The semiclassical approach (based on a Boltzmann-Langevin equation) is shown to be in complete agreement with a fully quantum mechanical theory, provided that the effects of wave localization can be neglected. The width of the peak in the power spectrum around zero frequency is much smaller than the inverse coherence time, characteristic for black-body radiation. Simple expressions for the shape of this peak are obtained, in the absorbing case, for waveguide lengths large compared to the absorption length, and, in the amplifying case, close to the laser threshold.
Beenakker C. W. J.
Mishchenko Eugene G.
Patra Manas
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