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| VOLUME 64 (1996) | ISSUE 4 |
PAGE 289
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Reflectance fluctuations in an absorbing random waveguide
Misirpashaev T.Sh., Beenakker C.W.J.
We study the statistics of the reflectance (the ratio of reflected and incident intensities) of an TV-mode disordered waveguide with weak absorption -γ per mean free path. Two distinct regimes are identified. The regime -Õìç2 ;> 1 shows universal fluctuations. With increasing length L of the waveguide, the variance of the reflectance changes from the value 2/15ΛΓ2, characteristic for universal conductance fluctuations in disordered wires, to another value 1/8ΛΓ2, characteristic for chaotic cavities. The weak-localisation correction to the average reflectance performs a similar crossover from the value 1/3N to 1/4ΛΓ. In the regime ύΝ1 <| 1, the large-L distribution of the reflectance R becomes very wide and asymmetric, P(R) ÏÓ (1 ñ)"2 for ì < 1 η/Ν. PACS: 05.40.+j, 42.25.Bs, 78.20.Ci
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![](/ps/980/article_14940_800_head.png "<b>We study the statistics of the reflectance (the ratio of reflected and incident intensities) of an TV-mode disordered waveguide with weak absorption -γ per mean free path. Two distinct regimes are identified. The regime -Õìç<sup>2</sup> ;> 1 shows universal fluctuations. With increasing length <i>L </i>of the waveguide, the variance of the reflectance changes from the value 2/15ΛΓ<sup>2</sup>, characteristic for universal conductance fluctuations in disordered wires, to another value 1/8ΛΓ<sup>2</sup>, characteristic for chaotic cavities. The weak-localisation correction to the average reflectance performs a similar crossover from the value <i>1/3N </i>to 1/4ΛΓ. In the regime <i>ύΝ<sup>1</sup> </i><| 1, the large-L distribution of the reflectance <i>R </i>becomes very wide and asymmetric, <i>P(R) </i>ÏÓ (1 ñ)"<sup>2</sup> for ì < 1 </b><b><i>η</i></b><b><i>/Ν.</i></b> <b>PACS: 05.40.+j, </b><a href=\"http://42.25.Bs\"><b>42.25.Bs</b></a><b>, 78.20.Ci</b>")