Third-order nonlinear optical properties of hybrid films of biopolymer-CdSe/ZnS core-shell quantum dots

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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.

Keywords:
CdSe/ZnS core_shell quantum dots /

nonlinear optical property /

photoluminescence
Authors and contacts
Ding Sha¹,

Wang Xiao-Hui³,

Du Yu-Min³,

Wang Qu-Quan²

(1)武汉大学物理系，武汉 430072; (2)武汉大学物理系，武汉 430072;武汉大学纳米科学与技术研究中心，武汉 430072; (3)武汉大学资源与环境科学学院，武汉 430072
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