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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.


The position of the differential optical density minimum as a function of laser fluence.The data are extracted from the spectra shown in Fig. 3.
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f4: The position of the differential optical density minimum as a function of laser fluence.The data are extracted from the spectra shown in Fig. 3.

Mentions: Figure 3 shows that the linear dichroism of the modified GMN is non-monotonous function of the laser fluence. Specifically, the SPR associated with (i.e. when ΔD is negative) becomes stronger when the fluence increases up to 0.625 J/cm2 (Fig.3(a)), and its strength decreases for higher fluences (Fig. 3(b)). Figure 4 shows the spectral position of the differential optical density minimum as a function of laser fluence. The dependence behaviour can be due to the heat accumulation at higher laser intensities that prevents complete solidification of silver spheroids between two subsequent femtosecond pulses and partial destruction of nanoparticles15.


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)

The position of the differential optical density minimum as a function of laser fluence.The data are extracted from the spectra shown in Fig. 3.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: The position of the differential optical density minimum as a function of laser fluence.The data are extracted from the spectra shown in Fig. 3.
Mentions: Figure 3 shows that the linear dichroism of the modified GMN is non-monotonous function of the laser fluence. Specifically, the SPR associated with (i.e. when ΔD is negative) becomes stronger when the fluence increases up to 0.625 J/cm2 (Fig.3(a)), and its strength decreases for higher fluences (Fig. 3(b)). Figure 4 shows the spectral position of the differential optical density minimum as a function of laser fluence. The dependence behaviour can be due to the heat accumulation at higher laser intensities that prevents complete solidification of silver spheroids between two subsequent femtosecond pulses and partial destruction of nanoparticles15.

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.