Peng Xiao-Niu, Zhou Zhang-Kai, Zhang Wei, Hao Zhong-Hua
Department of Physics, Wuhan University, Wuhan 430072, China.
Opt Express. 2011 Nov 21;19(24):24804-9. doi: 10.1364/OE.19.024804.
We demonstrate tuning emission band of CdSe/ZnS semiconductor quantum dots (SQDs) closely-packed in the proximity of Ag nanorod array by dynamically adjusting exciton-plasmon interaction. Large red-shift is observed in two-photon luminescence (TPL) spectra of the SQDs when the longitudinal surface plasmon resonance (LSPR) of Ag nanorod array is adjusted to close to excitation laser wavelength, and the spectral red-shift of TPL reaches as large as 101 meV by increasing excitation power, which is slightly larger than full width at half-maximum of emission spectrum of the SQDs. The observed LSPR-dependent spectral shifting behaviors are explained by a theoretical model of plasmon-enhanced quantum-confined Stark effect. These observations could find the applications in dynamical information processing in active plasmonic and photonic nanodevices.
我们通过动态调节激子 - 等离子体相互作用，展示了紧密堆积在银纳米棒阵列附近的CdSe/ZnS半导体量子点（SQDs）发射带的调谐。当银纳米棒阵列的纵向表面等离子体共振（LSPR）被调节到接近激发激光波长时，在SQDs的双光子发光（TPL）光谱中观察到大幅红移，并且通过增加激发功率，TPL的光谱红移达到高达101 meV，这略大于SQDs发射光谱的半高宽。观察到的依赖LSPR的光谱移动行为由等离子体增强量子限制斯塔克效应的理论模型进行了解释。这些观察结果可在有源等离子体和光子纳米器件的动态信息处理中找到应用。
