期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 45, 期 -, 页码 162-165出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2012.07.023
关键词
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资金
- National Nature Science Foundation of China [61108018]
- Heilongjiang Province Science Foundation [F201112, F201032]
- Heilongjiang Province Educational Bureau Foundation [11531283]
- Foundation from Key Laboratory of Electronics Engineering, College of Heilongjiang Province [DZZD200801]
Nonlinear absorption of Ag nanoparticles was investigated using open aperture Z-scan method with femtosecond laser pulses at 400 nm. It was found that, at low intensities, Ag nanoparticles behave as saturable absorbers but at higher intensities a shift from saturable absorption to reverse saturable absorption occurs. And open aperture Z-scan curves become asymmetric when the repetition rate of pulse laser is high. The transition process and asymmetry were analyzed in terms of plasmon bleaching, free carrier absorption and migration of Ag nanoparticles at surface plasmon resonance. (C) 2012 Elsevier B.V. All rights reserved.
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