Anderson localization of light in a random configuration of semiconductor nanocolumns
Anderson localization of light in a random configuration of semiconductor nanocolumns
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DOI：
10.1117/12.876128
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发表时间：
2011-03
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影响因子：
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通讯作者：
Y. Inose;M. Sakai;K. Ema;A. Kikuchi;K. Kishino;T. Ohtsuki
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文献类型：
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作者：
Y. Inose;M. Sakai;K. Ema;A. Kikuchi;K. Kishino;T. Ohtsuki
在由无序排列的电介质圆柱系综组成的二维随机系统中，光的安德森局域化是可能的。我们示出了采用氮化镓纳米柱样品的参数的光局部化的局部化参数图，所述氮化镓纳米柱样品由平行纳米尺寸柱状半导体晶体的随机阵列组成。的地图表示的光频率，柱的半径，和填充分数的列的本地化特性的参数依赖性。为了得到的地图，我们模拟了时间的光在随机介质中的扩散，使用二维时域有限差分方法和分析的模拟结果，通过傅立叶变换。结果表明，局域化的主要机制随着柱填充率的变化而不断变化，从单柱的Mie共振到柱系综的类布拉格衍射。
In the two-dimensional random system composed of a disordered array of a dielectric cylindrical column ensemble, Anderson localization of light is possible. We show localization parameter maps for the light localization adopting parameters of gallium nitride nanocolumn samples, which consist of random arrays of parallel nanosized columnar semiconductor crystals. The maps indicate parametric dependence of the localization characteristics on the light frequency, the radius of the columns, and the filling fraction of the columns. To obtain the maps, we have simulated temporal light diffusion in random media using the two-dimensional finite-difference time-domain method and analyzed the simulation results by Fourier transformation. We conclude that the main mechanism for localization varies continuously with the column filling fraction from Mie resonance of single column to Bragg-like diffraction of the column ensemble.