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Revealing the nanoparticles aspect ratio in the glass-metal nanocomposites irradiated with femtosecond laser.

Chervinskii S, Drevinskas R, Karpov DV, Beresna M, Lipovskii AA, Svirko YP, Kazansky PG - Sci Rep (2015)

Bottom Line: Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence.We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2.The developed approach can be employed to control the anisotropy of the glass-metal composites.

View Article: PubMed Central - PubMed

Affiliation: Institute of Photonics, University of Eastern Finland, P.O.Box 111 Joensuu, FI-80101 Finland.

ABSTRACT
We studied a femtosecond laser shaping of silver nanoparticles embedded in soda-lime glass. Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence. We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2. The developed approach can be employed to control the anisotropy of the glass-metal composites.

No MeSH data available.


Differential optical density of the modified GMN.(a) Low power regime: the resonance band shifts towards longer wavelengths, and its strength increases as the laser power increases. (b) High-power regime: the resonance band shifts towards shorter wavelengths, and its strength decreases as the laser power increases.
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f3: Differential optical density of the modified GMN.(a) Low power regime: the resonance band shifts towards longer wavelengths, and its strength increases as the laser power increases. (b) High-power regime: the resonance band shifts towards shorter wavelengths, and its strength decreases as the laser power increases.

Mentions: Figure 3 demonstrates the difference in optical densities of the modified GMN for orthogonally polarized probe beams. One can see two strong bands in the vicinity of 450 nm and 750 nm that dominate the linear dichroism spectrum of the processed GMN substrate. The linear dichroism originates from the splitting of the surface plasmon resonance (SPR) when spherical silver nanoparticles are elongated by the femtosecond laser irradiation2. In other words, the SPR position in the transmittance spectrum is different for s and p-polarized probe beams.


Revealing the nanoparticles aspect ratio in the glass-metal nanocomposites irradiated with femtosecond laser.

Chervinskii S, Drevinskas R, Karpov DV, Beresna M, Lipovskii AA, Svirko YP, Kazansky PG - Sci Rep (2015)

Differential optical density of the modified GMN.(a) Low power regime: the resonance band shifts towards longer wavelengths, and its strength increases as the laser power increases. (b) High-power regime: the resonance band shifts towards shorter wavelengths, and its strength decreases as the laser power increases.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562248&req=5

f3: Differential optical density of the modified GMN.(a) Low power regime: the resonance band shifts towards longer wavelengths, and its strength increases as the laser power increases. (b) High-power regime: the resonance band shifts towards shorter wavelengths, and its strength decreases as the laser power increases.
Mentions: Figure 3 demonstrates the difference in optical densities of the modified GMN for orthogonally polarized probe beams. One can see two strong bands in the vicinity of 450 nm and 750 nm that dominate the linear dichroism spectrum of the processed GMN substrate. The linear dichroism originates from the splitting of the surface plasmon resonance (SPR) when spherical silver nanoparticles are elongated by the femtosecond laser irradiation2. In other words, the SPR position in the transmittance spectrum is different for s and p-polarized probe beams.

Bottom Line: Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence.We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2.The developed approach can be employed to control the anisotropy of the glass-metal composites.

View Article: PubMed Central - PubMed

Affiliation: Institute of Photonics, University of Eastern Finland, P.O.Box 111 Joensuu, FI-80101 Finland.

ABSTRACT
We studied a femtosecond laser shaping of silver nanoparticles embedded in soda-lime glass. Comparing experimental absorption spectra with the modeling based on Maxwell Garnett approximation modified for spheroidal inclusions, we obtained the mean aspect ratio of the re-shaped silver nanoparticles as a function of the laser fluence. We demonstrated that under our experimental conditions the spherical shape of silver nanoparticles changed to a prolate spheroid with the aspect ratio as high as 3.5 at the laser fluence of 0.6 J/cm2. The developed approach can be employed to control the anisotropy of the glass-metal composites.

No MeSH data available.