Moreels, Iwan; Universiteit Gent - Ugent > Physical chemistry department
Kockaert, Pascal; Université Libre de Bruxelles - ULB > Optics and acoustics department
Van Deun, Rick; Universiteit Gent - Ugent > Department of Chemistry
Driesen, Koen; Universiteit Gent - Ugent > Department of chemistry
Loicq, Jerôme ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Van Thourhout, Dries; Universiteit Gent - Ugent > Department of Information technology
Language :
English
Title :
The non-linear refractive index of colloidal PbSe nanocrystals:Spectroscopy and saturation behaviour
Publication date :
2006
Journal title :
Journal of Luminescence
ISSN :
0022-2313
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
121
Pages :
369-374
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
A spectroscopic study of the optical non-linearities of PbSe colloidal solutions was performed with the Z-scan technique, at wavelengths between 1200 and 1750 nm. No non-linear absorption is observed, while the third-order non-linear refractive index n2 shows
clear resonances, somewhat blueshifted relative to the exciton transitions in the absorbance spectrum. The occurrence of thermal effects is ruled out by time-resolved measurements. At resonance, measured n2 values exceed typical bulk semiconductor values by two orders of
magnitude. At high optical intensity, the refractive index change saturates, indicating that state filling lies at the origin of the observed effect.
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