All-optical polarization switching based on Bragg-spaced quantum dots layers
All-optical polarization switching based on Bragg-spaced quantum dots layers
复制标题
DOI：
10.1016/j.optcom.2011.01.086
复制
发表时间：
2011-06
影响因子：
2.4
通讯作者：
Kunhui Xiao;Tao Wang;Qing Li;Chunchao Yu
中科院分区：
文献类型：
--
作者：
Kunhui Xiao;Tao Wang;Qing Li;Chunchao Yu
本文提出了一种布拉格间隔全光开关，并将量子点系综用于其中作为有源层。利用一维光子晶体理论和传输矩阵方法，研究了基于交流斯塔克效应的反射率阻带和开关效应。这种开关的反射阻带可以被抑制或恢复，圆二向色性和双折射是由圆偏振控制光引起的，具有显著的偏振开关效应。这种开关结构具有对泵浦光强要求低、对比度大等优点，特别是在理论上可以在室温下使用。因此，我们预测它作为全光交换在高速光通信中有着巨大的应用前景。
One kind of Bragg-spaced all-optical switching has been proposed in this paper, and the quantum dots ensembles are used in it as active layers. By one-dimensional photonic crystal theory and transmission matrix method, we have studied the reflectivity stop band and switching effect based on the ac Stark effect. The reflectivity stop band of this switch can be suppressed or recovered, and the circular dichroism and birefringence are induced by a circle-polarized control light, which result in a significant polarization switching effect. This switching structure shows great advantages of lower requirement of pump light intensity, larger contrast ratio than that of Bragg-spaced quantum wells with the same period, especially this switching can be used at room temperature theoretically. So we predict that there are prodigious prospects for its using in high speed optical communications as all-optical switching.