紫外胶基底中CdSe/ZnS量子点的吸收与色散非线性关系的确定  

Determination of Nonlinear Dependence Between Absorption and Dispersion of CdSe/ZnS Quantum Dots Doped in Ultraviolet Glue

作　　者：程成[1] 翟诗滔 

机构地区：[1]浙江工业大学激光与光电子技术研究所,浙江杭州310023

出　　处：《光学学报》2014年第6期156-162,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61274124)

摘　　要：根据朗伯-比尔定律，利用吸收光谱法，测量了CdSe／ZnS（核／壳）量子点紫外固化胶溶液在0．073～0．367mg·mL-1掺杂浓度、450-850nm波长范围内的吸收系数，得到了吸收系数关于浓度、波长的经验公式。测量了在不同掺杂浓度下量子点溶液的折射率随波长的变化，得到了折射率关于浓度、波长的经验公式。估算了纯量子点的折射率，并与CdSe和ZnS块材料折射率作对比。由实验结果得到吸收系数直接关联于折射率的变化，给出了相应的物理解释。对比经典散射理论谐振子模型的吸收系数和实验结果，得到了CdSe／ZnS量子点的谐振频率和阻尼系数等参量。Using absorption spectrum method and Lambert-Beer law, the absorption coefficient of CdSe/ZnS （core/ shell） quantum dots （QDs） doped in ultraviolet （UV） glue is measured with wavelength range of 450-850 nm and doping concentration of 0. 073 - 0. 367 mg· mL-1. An empirical formula of absorption coefficient related with the wavelength and doping concentration is presented. The refractive index of the QD doping UV gel as a function of wavelength is measured with different doping concentrations. An empirical formula of the refractive index related with the wavelength and doping concentration is obtained. The refractive index of pure QDs is also estimated and compared with that of bulk CdSe and ZnS. Based on the experimental results, the absorption coefficient is further related with the refractive index, and physical interpretation is discussed. The resonance frequency and damping constant of CdSe/ZnS QDs in a harmonic oscillator model are proposed by comparison of the absorption coefficient between the classical scattering theory and the experimental results.

关 键 词：量子光学 CDSE ZnS量子点 吸收系数 折射率 波长 谐振频率 

分 类 号：O436.2[机械工程—光学工程]