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物理学报. 2006, 55(2): 753-757.
doi: 10.7498/aps.55.753.
生物大分子杂化处理的CdSe/ZnS核/壳量子点多层膜的超快三阶非线性研究
- 收稿日期: 2005-05-26
- 修回日期: 2005-07-06
- 刊出日期: 2006-01-05
摘要: 利用静电自组装技术，以生物大分子材料壳聚糖杂化处理具有稳定结构的CdSe/ZnS核/壳量子点，形成复合多层薄膜. 与薄膜的吸收谱线比较，在375nm飞秒激光激发下测量的量子点的光致发光谱存在Stokes位移. 采用Z扫描技术，利用790nm飞秒激光研究了其三阶非线性吸收和折射特性，发现饱和吸收信号来自CdSe/ZnS量子点，而自聚焦的折射信号则部分来自壳聚糖. 测出多层膜的三阶非线性系数分别是β＝6.5×10-6cm/W，n2＝1.5×10-10cm2/W.
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关键词:
- CdSe/ZnS量子点 /
- 非线性性能 /
- 光致发光谱
English Abstract
Third-order nonlinear optical properties of hybrid films of biopolymer-CdSe/ZnS core-shell quantum dots
- Received Date:
26 May 2005
- Accepted Date:
06 July 2005
- Published Online:
05 January 2006
Abstract: Biopolymer_CdSe/ZnS core_shell quantum dot hybrid films were prepared using self_assembly technique. Compared with the absorbance spectrum, the photoluminescence excited by laser with λ=395nm has Stokes shift. The third_order nonlinear optical properties of biopolymer_CdSe/ZnS film were studied by Z_scan setup with femtosecond laser at 790nm. It is found that the nonlinear absorptive signal partially originates from Cde/ZnS quantum dots while the nonlinear refractive signal partially originates from biopolymer chitosan. The magnitudes of them are measured to be β＝6.5×10-6cm/W and n2＝1.5×10-10cm2/W, respectively.
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