Near resonant third-order optical nonlinearities of colloidal InP/ZnS quantum dots
Author
Wang, Y.
Yang, X.
He, T. C.
Gao, Y.
Demir, Hilmi Volkan
Sun, X. W.
Sun, H. D.
Date
2013Source Title
Applied Physics Letters
Print ISSN
0003-6951
Publisher
AIP Publishing
Volume
102
Issue
2
Pages
021917-1 - 021917-4
Language
English
Type
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Show full item recordAbstract
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.
Keywords
ColloidsExcitons
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