Optical bistability and nonlinearity of coherently coupled exciton-plasmon systems
Optical bistability and nonlinearity of coherently coupled exciton-plasmon systems
复制标题
相干耦合激子-等离子体激元系统的光学双稳态和非线性
DOI：
10.1364/oe.20.001856
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发表时间：
2012-01-16
期刊：
影响因子：
3.8
通讯作者：
Wang, Qu-Quan
中科院分区：
文献类型：
--
作者：
Li, Jian-Bo;Kim, Nam-Chol;Wang, Qu-Quan
本文从理论上研究了强控制场和弱探测场作用下相干耦合激子-等离激元混合系统的三阶非线性光学性质。推导了金属纳米粒子（MNP）与半导体量子点（SQD）杂化体系激子布居数和有效三阶光学极化率的解析表达式。揭示了该体系中的激子布居数以及诱导的非线性吸收和折射响应。双稳区可以通过调节金属纳米颗粒的尺寸、颗粒间距和控制场强度来调节。我们的结果在激子-等离子体激元共振耦合的光信息处理中具有重要的应用前景。(C)2012美国光学学会
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. (C) 2012 Optical Society of America