Cherpakova Z, Bleckmann F, Vogler T, Linden S
Opt Lett. 2017 Jun 1;42(11):2165-2168. doi: 10.1364/OL.42.002165.
We investigate the effect of disorder on the propagation of surface plasmon polaritons in arrays of evanescently coupled dielectric loaded surface plasmon polariton waveguides. Diagonal disorder is implemented by randomly varying the heights of the waveguides. Real-space as well as momentum-space images of the surface plasmon polariton intensity distribution in the waveguide arrays are recorded by leakage radiation microscopy. In real space, increasing disorder results in a transverse localization of surface plasmon polaritons. In the momentum distribution, we observe for the first time a disorder-induced transition from a continuous band to a set of discrete modes.
我们研究了无序对倏逝耦合介质加载表面等离激元极化激元波导阵列中表面等离激元极化激元传播的影响。通过随机改变波导的高度来实现对角无序。利用泄漏辐射显微镜记录了波导阵列中表面等离激元极化激元强度分布的实空间和动量空间图像。在实空间中，无序程度的增加导致表面等离激元极化激元的横向局域化。在动量分布中，我们首次观察到由无序诱导的从连续能带到一组离散模式的转变。
