Article (Scientific journals)
Spectroscopy of the nonlinear refractive index of colloidal PbSe nanocrystals
Moreels, Iwan; Hens, Zeger; Kockaert, Pascal et al.
2006In Applied Physics Letters, 89, p. 193106
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Keywords :
nonlinear optics; nanoparticles; z-scan; PbSe
Abstract :
[en] A spectroscopic study of the optical nonlinearity of PbSe colloidal solutions was performed with the Z-scan technique at wavelength intervals of 1200–1350 and 1540–1750 nm. While nonlinear absorption remains below the detection threshold, the third order nonlinear 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 1.55 m, measured resonant n2 values exceed typuial blk semiconductor values by two orders of magnitude. At high optical intensity, the refractive index change saturates, indicating that statefilling lies at the origin of the observed effect.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Moreels, Iwan;  Universiteit Gent - Ugent > Physics and Chemistry of Nanostructures
Hens, Zeger;  Universiteit Gent - Ugent > Physics and Chemistry of Nanostructures
Kockaert, Pascal;  Université Libre de Bruxelles - ULB > Optics and acoustics Departement
Loicq, Jerôme ;  Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Van Thourhout, Dries;  Universiteit Gent - Ugent - IMEC > Department of information Technology
Language :
English
Title :
Spectroscopy of the nonlinear refractive index of colloidal PbSe nanocrystals
Publication date :
07 November 2006
Journal title :
Applied Physics Letters
ISSN :
0003-6951
eISSN :
1077-3118
Publisher :
American Institute of Physics, Melville, United States - New York
Volume :
89
Pages :
193106
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 June 2010

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