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/content/aip/journal/aplmater/3/11/10.1063/1.4935748
2015-11-16
2016-12-07

Abstract

Spectrally resolved nonlinear optical properties of colloidal InP@ZnS core-shell quantum dots of various sizes were investigated with the Z-scan technique and two-photon fluorescence excitation method using a femtosecond laser system tunable in the range from 750 nm to 1600 nm. In principle, both techniques should provide comparable results and can be interchangeably used for determination of the nonlinear optical absorption parameters, finding maximal values of the cross sections and optimizing them. We have observed slight differences between the two-photonabsorption cross sections measured by the two techniques and attributed them to the presence of non-radiative paths of absorption or relaxation. The most significant value of two-photonabsorption cross section σ for 4.3 nm size InP@ZnS quantum dot was equal to 2200 GM, while the two-photon excitation action cross section σΦ was found to be 682 GM at 880 nm. The properties of these cadmium-free colloidalquantum dots can be potentially useful for nonlinear bioimaging.

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