Li Jian-Bo, Kim Nam-Chol, Cheng Mu-Tian, Zhou Li, Hao Zhong-Hua, Wang Qu-Quan
Department of Physics, Wuhan University, Wuhan, China.
Opt Express. 2012 Jan 16;20(2):1856-61. doi: 10.1364/OE.20.001856.
We theoretically investigated optical third-order nonlinearity of a coherently coupled exciton-plasmon hybrid system under a strong control field with a weak probe field. The analytic formulas of exciton population and effective third-order optical susceptibility of the hybrid of a metal nanoparticle (MNP) and a semiconductor quantum dot (SQD) were deduced. The bistable exciton population and the induced bistable nonlinear absorption and refraction response were revealed. The bistability region can be tuned by adjusting the size of metal nanoparticle, interparticle distance and intensity of control field. Our results have perspective applications in optical information processing based on resonant coupling of exciton-plasmon.
我们从理论上研究了在强控制场和弱探测场作用下相干耦合激子 - 等离子体混合系统的光学三阶非线性。推导了金属纳米颗粒（MNP）与半导体量子点（SQD）混合体系中激子布居数和有效三阶光学极化率的解析公式。揭示了双稳激子布居数以及诱导的双稳非线性吸收和折射响应。通过调整金属纳米颗粒的尺寸、颗粒间距离和控制场强度可以调节双稳区域。我们的结果在基于激子 - 等离子体共振耦合的光学信息处理方面具有潜在应用。
