Surface-related two-photon absorption and refraction of CdSe quantum dots

被引：50
|
作者：
Zhu, B. H. [1 ]
Zhang, H. C. [1 ]
Zhang, J. Y. [1 ]
Cui, Y. P. [1 ]
Zhou, Z. Q. [1 ]
机构：
[1] Southeast Univ, Adv Photon Ctr, Nanjing 210096, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 02期
基金：
中国国家自然科学基金;
关键词：
SIZE;
D O I：
10.1063/1.3610561
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Colloidal CdSe quantum dots (QDs), whose surface traps are controlled with the purification process, are measured with a Z-scan technique using an 80 femtosecond pulse duration laser source. Their two-photon absorption coefficient and refractive index are decreased more than one order of magnitude with the increase of the density of surface traps, indicating that the surface states are involved in the two-photon process. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3610561]
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页数：3
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