Near resonant third-order optical nonlinearities of colloidal InP/ZnS quantum dots

Date
2013
Advisor
Instructor
Source Title
Applied Physics Letters
Print ISSN
0003-6951
Electronic ISSN
Publisher
AIP Publishing
Volume
102
Issue
2
Pages
021917-1 - 021917-4
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

We have investigated the third-order optical nonlinearities of high-quality colloidal InP/ZnS core-shell quantum dots (QDs) using Z-scan technique with femtosecond pulses. The two-photon absorption cross-sections as high as 6.2 × 103 GM are observed at 800 nm (non-resonant regime) in InP/ZnS QDs with diameter of 2.8 nm, which is even larger than those of CdSe, CdS, and CdTe QDs at similar sizes. Furthermore, both of the 2.2 nm and 2.8 nm-sized InP/ZnS QDs exhibit strong saturable absorption in near resonant regime, which is attributed to large exciton Bohr radius in this material. These results strongly suggest the promising potential of InP/ZnS QDs for widespread applications, especially in two-photon excited bio-imaging and saturable absorbing.

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Book Title
Keywords
Colloids, Excitons, High-speed Optical Techniques, Iii-v Semiconductors, Ii-vi Semiconductors, Indium Compounds, Nonlinear Optics, Semiconductor Quantum Dots, Two-photon Spectra, Ultraviolet Spectra, Visible Spectra, Wide Band Gap Semiconductors, Zinc Compounds
Citation
Published Version (Please cite this version)