ICFO—Institut de Ciencies Fotoniques, and Universitat Politecnica de Catalunya, 08860 Castelldefels (Barcelona), Spain.
Opt Lett. 2012 Oct 1;37(19):4020-2. doi: 10.1364/OL.37.004020.
We show that Anderson localization is possible in waveguide arrays with periodically spaced defect waveguides having a lower refractive index. Such localization is mediated by Bragg reflection, and it takes place even if diagonal or off-diagonal disorder affects only defect waveguides. For off-diagonal disorder the localization degree of the intensity distributions monotonically grows with increasing disorder. In contrast, under appropriate conditions, increasing diagonal disorder may result in weaker localization.
我们证明了在具有较低折射率的周期性间隔缺陷波导的波导阵列中可以实现安德森局域化。这种局域化是由布拉格反射介导的，即使对角或非对角无序仅影响缺陷波导，也会发生这种局域化。对于非对角无序，强度分布的局域化程度随着无序的增加而单调增加。相比之下，在适当的条件下，增加对角无序可能会导致较弱的局域化。
