Light transport in random media with PT symmetry

被引：23

作者：

Kalish, Samuel ^{[1
]}

Lin, Zin ^{[1
]}

Kottos, Tsampikos ^{[1
,2
]}

机构：

[1] Wesleyan Univ, Dept Phys, Middletown, CT 06457 USA

[2] Max Planck Inst Dynam & Self Org, D-37073 Gottingen, Germany

来源：

PHYSICAL REVIEW A | 2012年 / 85卷 / 05期

基金：

美国国家科学基金会;

关键词：

ANDERSON LOCALIZATION; ABSORPTION;

D O I：

10.1103/PhysRevA.85.055802

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The scattering properties of randomly layered optical media with PT-symmetric index of refraction are studied using the transfer-matrix method. We find that the transmittance decays exponentially as a function of the system size, with an enhanced rate xi(gamma)(W)(-1) = xi(0)(W)(-1) + xi(gamma)(0)(-1), where xi(gamma)(W) is the localization length of the equivalent passive random medium and xi(gamma)(0) is the attenuation and amplification length of the corresponding perfect system with a PT-symmetric refraction index profile. While transmittance processes are reciprocal to left-and right-incident waves, the reflectance is enhanced from one side and is inversely suppressed from the other, thus allowing such PT-symmetric random media to act as unidirectional coherent absorbers.

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页数：5

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