Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles
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. Specific...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/11/10/2485 |
| _version_ | 1827678997499084800 |
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| author | Jijuan Jiang Yang Jia Tong Wu Yachen Gao |
| author_facet | Jijuan Jiang Yang Jia Tong Wu Yachen Gao |
| author_sort | Jijuan Jiang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T06:20:37Z |
| format | Article |
| id | doaj.art-f24237e657204739b7141f78462b60f4 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T06:20:37Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-f24237e657204739b7141f78462b60f42023-11-22T19:22:00ZengMDPI AGNanomaterials2079-49912021-09-011110248510.3390/nano11102485Transformation from Self-Focusing to Self-Defocusing of Silver NanoparticlesJijuan Jiang0Yang Jia1Tong Wu2Yachen Gao3College of Electronic Engineering, Heilongjiang University, Harbin 150080, ChinaCollege of Electronic Engineering, Heilongjiang University, Harbin 150080, ChinaCollege of Electronic Engineering, Heilongjiang University, Harbin 150080, ChinaCollege of Electronic Engineering, Heilongjiang University, Harbin 150080, ChinaThe 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.https://www.mdpi.com/2079-4991/11/10/2485silver nanoparticlesthird-order nonlinear refractionfifth-order nonlinear refractionZ-scan |
| spellingShingle | Jijuan Jiang Yang Jia Tong Wu Yachen Gao Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles Nanomaterials silver nanoparticles third-order nonlinear refraction fifth-order nonlinear refraction Z-scan |
| title | Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles |
| title_full | Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles |
| title_fullStr | Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles |
| title_full_unstemmed | Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles |
| title_short | Transformation from Self-Focusing to Self-Defocusing of Silver Nanoparticles |
| title_sort | transformation from self focusing to self defocusing of silver nanoparticles |
| topic | silver nanoparticles third-order nonlinear refraction fifth-order nonlinear refraction Z-scan |
| url | https://www.mdpi.com/2079-4991/11/10/2485 |
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