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Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles
- Source :
- Nanomaterials, Vol 11, Iss 2485, p 2485 (2021), Nanomaterials, Volume 11, Issue 10
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- The nonlinear refraction of silver nanoparticles (AgNPs) in n-hexane was studied by using the closed-aperture Z-scan technique with a 532 nm nanosecond laser. It was found that, the nonlinear refraction of AgNPs shows the coexistence and transformation from self-focusing to self-defocusing. Specifically, self-focusing occurs at low excitation intensity, self-defocusing occurs at high excitation intensity, and coexistence of self-focusing and self-defocusing occurs at relatively moderate excitation intensity. The experimental results were analysed and discussed in terms of third-order and fifth-order nonlinear refractive effect. Specifically, the self-focusing is caused by the positive third-order nonlinear refraction, the self-defocusing is induced by the negative fifth-order nonlinear refraction, and the transformation from the self-focusing to self-defocusing at medium excitation intensity is caused by the competition of third-order and fifth-order nonlinear refraction. Finally, the third-order refractive index and fifth-order refractive index were obtained.
- Subjects :
- silver nanoparticles
third-order nonlinear refraction
Materials science
Z-scan
General Chemical Engineering
Physics::Optics
Self-focusing
Molecular physics
Silver nanoparticle
Article
Intensity (physics)
Nonlinear system
Chemistry
Transformation (function)
General Materials Science
Z-scan technique
fifth-order nonlinear refraction
Refractive index
QD1-999
Excitation
Subjects
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 11
- Issue :
- 2485
- Database :
- OpenAIRE
- Journal :
- Nanomaterials
- Accession number :
- edsair.doi.dedup.....2faffccdcff0407274cf43283c320938