平面半导体微腔中激子极化激元的非线性特性研究

Strong coupling between exciton and photon in planar semiconductor microcavity leads to the formation of exciton-polariton(EP), which is a quasiparticle with half-light and half-matter nature.The physics of EP Bose-Einstein condensates is rich and interesting. And EP is the best candidate for the design of ultra-low threshold polariton lasers without inversion. Owing to the special properties and potential applications of EP, much attention has been drawn on them in recent years. However, the behaviour of EP is still obscure. In this project, we will research the nonlinear behaviour of EP in GaAs/AlAs planar microcavity. Our research includes tow major parts, first, EP bistability will be illustrated in this structure by changing either the circumstance of the sample or the polarization of the incident beam; then, optical parametric oscillation of EP in this system will be investigated by pump-probe experiments, and the nonlinear process of EP-EP interactions will be depicted. The implement of this project will be helpful for the understanding of the nonlinear behaviour of EP, and should be able to pave the way to the design of all-optical switch and solid-state micro-parametric oscillator.

激子极化激元（EP）的波色爱因斯坦凝聚现象蕴含着许多丰富而有趣的内容，同时EP也是研发低阈值且无反转的极化激元激光器的有效载体，因此近年来对具有半光半物质属性的EP的研究方兴未艾，但目前对EP特性的认识依然存在着许多争议。本项目拟以加工工艺比较成熟的砷化铝镓平面半导体微腔为研究对象，围绕着EP的非线性特性开展以下两个方面的研究：1）通过改变微腔样品所处的环境或改变入射光束的偏振属性等手段来探索如何简单有效的控制EP的双稳态特性；2）在光学泵浦探测平台上研究EP的光学参量振荡特性，并对极化激元间相互作用的非线性过程进行理论建模与分析。本项目的实施将有助于加深人们对EP的非线性特性及其内在机理的认识，并将为全光开关的设计和固态微型的参量振荡器的研发提供理论支持与实验支持。