基于周期性金属纳米结构的全光开关研究

摘要

基于非线性光学原理，周期性金属纳米结构与非线性光学材料复合可以实现全光开关。通过数值模拟周期性金属纳米结构附近的电磁场可知，周期性金属纳米结构的表面等离子体激元有着明显的局域场增强特性。这种强的局域场可以大大增加非线性材料的三阶非线性效应，使全光调控现象更明显，从而降低开关的阈值功率，并实现超快的响应速度，有望在将来全光通信网络中得到广泛应用。%On the basis of the principle of nonlinear optics,the conjugated metallic periodic structure with nonlinear optic mate-rial can realize all-optical switches.It is found from the numeric simulation of the electromagnetic field near nano-structure that its surface plasmons demonstrate distinct enhancement of the local field,which greatly increases the third-order nonlinear effect of the nonlinear material and makes the all-optical control still more dominant,thus reducing the threshold power of the swit-ches and realizing super-fast response speed.It is expected to be widely applied in the future all-optical communication net-works.