Open AccessThird-order nonlinear optical properties of hybrid films of biopolymer-CdSe/ZnS core-shell quantum dots
Author(s) -
Sha Ding,
Xiaohui Wang,
Yumin Du,
QuQuan Wang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.753
Subject(s) - quantum dot , femtosecond , materials science , biopolymer , laser , absorbance , photoluminescence , optoelectronics , photonics , nonlinear optics , core (optical fiber) , optics , nanotechnology , polymer , physics , composite material
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 β6.5×10-6cm/W and n21.5×10-10cm2/W, respectively.