Density of States and Extinction Mean Free Path of Waves in Random Media: Dispersion Relations and Sum Rules

被引：20

作者：

Carminati, R. ^{[1
]}

Saenz, J. J. ^{[2
,3
]}

机构：

[1] ESPCI, Inst Langevin, CNRS, UMR 7587,Lab Opt Phys, F-75231 Paris 05, France

[2] Univ Autonoma Madrid, Dept Fis Mat Condensada, E-28049 Madrid, Spain

[3] DIPC, Donostia San Sebastian 20018, Spain

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 09期

关键词：

SPONTANEOUS EMISSION; SCATTERING; LIGHT; DECAY;

D O I：

10.1103/PhysRevLett.102.093902

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We establish a fundamental relationship between the averaged local density of states and the extinction mean free path of waves propagating in random media. From the principle of causality and the Kramers-Kronig relations, we show that both quantities are connected by dispersion relations and are constrained by a frequency sum rule. The results should be helpful in the analysis of wave transport through complex media and in the design of materials with specific transport properties.

引用

页数：4

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