量子点
材料科学
吸收(声学)
吸收截面
飞秒
激发态
双光子吸收
激发
激光器
分子物理学
光子
荧光
光电子学
原子物理学
横截面(物理)
光学
化学
物理
复合材料
量子力学
作者
Dominika Wawrzyńczyk,Janusz Szeremeta,Marek Samoć,Marcin Nyk
出处
期刊:APL Materials
[American Institute of Physics]
日期:2015-11-01
卷期号:3 (11): 116108-116108
被引量:27
摘要
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-photon absorption 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-photon absorption cross section σ2 for 4.3 nm size InP@ZnS quantum dot was equal to 2200 GM, while the two-photon excitation action cross section σ2Φ was found to be 682 GM at 880 nm. The properties of these cadmium-free colloidal quantum dots can be potentially useful for nonlinear bioimaging.
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