非对称耦合量子阱ZnCdSe/ZnSe的喇曼散射谱与非线性光学特性

Nonlinear optics studies on nonlinear optics properties and Raman scattering of asymmetric coupled Zn_ 9(1-x)Cd_xSe/ZnSe quantum wells

采用荧光光谱和喇曼散射谱对非对称Ⅱ—Ⅵ族耦合多量子阱Zn1 -xCdxSe/ZnSe的结构进行了表征 ,并对它的非线性光学特性进行了研究。实验中观察到了比较明显的量子阱荧光峰 :在喇曼散射谱中观察到了分别对应于与ZnCdSe窄阱和宽阱的一级限制光学模LO1 (LowWell)和LO1 (WideWell) ,及对应于ZnSe/GaAs界面的声子和等离子体的耦合模。实验发现二次谐波信号的强度随着阱间耦合的增强而增强 ,说明非对称量子阱 (AQW)的耦合效应存在一阈值 。

The Raman scattering and fluorescence spectra in asymmetric coupled Zn 1-x Cd xSe/ZnSe quantum wells were investigated.We found that the quantum wells had a clear fluorescence peak.The limited optical patterns of low well and wide well in ZnCdSe well,and the couple pattern of phonon in the interwell coupling and there exists a threshold.With x increases,however,the SHG intensity decreases.