Enhanced three-photon absorption in CdSe/CdS core/shell nanocrystals in near-infrared

Colloidal CdSe nanocrystals are synthesized and successively overcoated with CdS monolayers (MLs). The three-photon absorption (3PA) properties are measured by Z-scan and nonlinear transmission techniques with 80 fs laser pulses at 1250 nm in the near-infrared. The 3PA enhancement factor due to the...

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Bibliographic Details
Published in:Applied physics express 2016-08, Vol.9 (8), p.82602
Main Authors: Zhu, Baohua, Wang, Fangfang, Zhang, Kun, Zhang, Jiayu, Gu, Yuzong
Format: Article
Language:English
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Summary:Colloidal CdSe nanocrystals are synthesized and successively overcoated with CdS monolayers (MLs). The three-photon absorption (3PA) properties are measured by Z-scan and nonlinear transmission techniques with 80 fs laser pulses at 1250 nm in the near-infrared. The 3PA enhancement factor due to the overcoating of three ML CdS was 850, significantly larger than that caused by a size increase of the CdSe cores. The 3PA enhancement mainly originates from the reduction of nonradiative traps on the cores surface. The effects of a local field and intrinsic piezoelectric polarization are also discussed.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.9.082602