Stability and nonlinear optical properties of Cu nanoparticles prepared by femtosecond laser ablation of Cu target in alcohol and water
Stability and nonlinear optical properties of Cu nanoparticles prepared by femtosecond laser ablation of Cu target in alcohol and water
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酒精和水中飞秒激光烧蚀铜靶制备铜纳米颗粒的稳定性和非线性光学性质
DOI：
10.1016/j.optcom.2014.04.006
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发表时间：
2014-11
影响因子：
2.4
通讯作者：
Han, Min
中科院分区：
文献类型：
--
作者：
Qu, Shiliang;Wang, Qiang;Gao, Renxi;Han, Min
以不同浓度的PVP为保护剂，在酒精、水及其混合物中激光烧蚀Cu靶材，制备了不同粒径的Cu纳米粒子。Cu NPs在醇中表现出良好的稳定性。研究了不同平均尺寸的铜纳米粒子的非线性吸收。随着激光强度的增加，小NPs的非线性吸收由饱和吸收（SA）转变为反向饱和吸收（RSA）和双光子吸收（TPA），而大NPs的非线性吸收以SA为主。提出了导带中占据和未占据态密度（DOS）的调制是影响非线性吸收尺寸依赖性的关键因素。对于大的Cu NPs，基态有足够的已占用的DOS，第一激发态有足够的未占用的DOS来维持SA的增加，而对于小的Cu NPs，相应的DOS不足，因此在高激光激发强度下，SA被RSA和TPA超越。
By using PVP of different concentrations as the protective agent, Cu nanoparticles (NPs) of different mean sizes are fabricated through laser ablation of Cu target in alcohol, water, and their mixtures. As-grown Cu NPs show good stability in alcohol. The nonlinear absorptions of Cu NPs with different mean sizes are investigated. With the increase of laser intensity, the nonlinear absorption of small NPs changes from saturable absorption (SA) to reverse saturable absorption (RSA) and two-photon absorption (TPA), whereas SA dominates the nonlinear absorption of the large NPs. The modulations of occupied and unoccupied density of states (DOS) in conduction band are proposed to be the key factors for the size-dependence of the nonlinear absorption. For the large Cu NPs, there are sufficiently occupied DOS in the ground state and unoccupied DOS in the first excited state to sustain the increase of SA, whereas for the small Cu NPs, the corresponding DOS is insufficient, so the SA is surpassed by the RSA and TPA at high laser excitation intensity.
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影响因子：
3.9
作者：
S. Qu;Yawen Zhang;Huajun Li;J. Qiu;Congshan Zhu
通讯作者：
S. Qu;Yawen Zhang;Huajun Li;J. Qiu;Congshan Zhu
影响因子：
3.2
作者：
Nichols, William T.;Sasaki, Takeshi;Koshizaki, Naoto
通讯作者：
Koshizaki, Naoto
影响因子：
3.2
作者：
Gurudas, Ullas;Brooks, Elijah;Wokaun, Alexander
通讯作者：
Wokaun, Alexander
影响因子：
3
作者：
B. Ghosh;P. Chakraborty;S. Mohapatra;P. Kurian;C. Vijayan;P. Deshmukh;P. Mazzoldi
通讯作者：
B. Ghosh;P. Chakraborty;S. Mohapatra;P. Kurian;C. Vijayan;P. Deshmukh;P. Mazzoldi
DOI：
10.1021/jp061799p
发表时间：
2006-07
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
Zhi-bo Liu;Yizhou Zhu;Yan Zhu;Shu-qi Chen;Jian-Yu Zheng;Jianguo Tian
通讯作者：
Zhi-bo Liu;Yizhou Zhu;Yan Zhu;Shu-qi Chen;Jian-Yu Zheng;Jianguo Tian