Optical Nonlinear Properties of CdSeS/ZnS Core/Shell Quantum Dots

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2008,（4）
• 页码范围: 1461-1464
• 页数: 4页
• 语种: 英文

摘要

The optical nonlinear properties of CdSeS/ZnS quantum dots (QDs) are investigated by Z-scan technique using fundamental harmonic generation (1064nm) of mode-locked Nd:YAG laser for the first time. The experimental results show that two photon absorptions (TPA) occur at input intensity up to 12.5 GW/cm2. CdSeS/ZnS QDs have an average TPA cross section of 13710GM and large nonlinear refractive index on order of 10-7 esu. The large optical nonlinearities perhaps allow the CdSeS/ZnS QDs to be one kind of candidate material for bioimaging and fluorescence label, optical limiting and all-optical switching.