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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.


Surface plasmon resonance wavelengths calculated for oblate and prolate silver spheroids of different aspect ratios in the glass matrix.Red and black solid line show SPR wavelength for the light polarized along a- and c-axis, respectively. The following parameters were used for the numerical simulations:  =4, λp = 135 nm, γ/ωp = 0.1[23],  = 2.72.
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f5: Surface plasmon resonance wavelengths calculated for oblate and prolate silver spheroids of different aspect ratios in the glass matrix.Red and black solid line show SPR wavelength for the light polarized along a- and c-axis, respectively. The following parameters were used for the numerical simulations:  =4, λp = 135 nm, γ/ωp = 0.1[23],  = 2.72.

Mentions: where is the high frequency permittivity, ωp is the plasma frequency, and γ is the electron scattering rate23. The model1 allows calculating SPR for a silver spheroid for the plasmonic oscillation along a-axis and c-axis. The dependence of SPR wavelengths on the spheroid aspect ratio is illustrated in Fig. 5. It is worth noting that in Fig. 5, the electron scattering at the surface of the spheroid is not taken into consideration, i.e. the size of the spheroid is not accounted for.


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)

Surface plasmon resonance wavelengths calculated for oblate and prolate silver spheroids of different aspect ratios in the glass matrix.Red and black solid line show SPR wavelength for the light polarized along a- and c-axis, respectively. The following parameters were used for the numerical simulations:  =4, λp = 135 nm, γ/ωp = 0.1[23],  = 2.72.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: Surface plasmon resonance wavelengths calculated for oblate and prolate silver spheroids of different aspect ratios in the glass matrix.Red and black solid line show SPR wavelength for the light polarized along a- and c-axis, respectively. The following parameters were used for the numerical simulations:  =4, λp = 135 nm, γ/ωp = 0.1[23],  = 2.72.
Mentions: where is the high frequency permittivity, ωp is the plasma frequency, and γ is the electron scattering rate23. The model1 allows calculating SPR for a silver spheroid for the plasmonic oscillation along a-axis and c-axis. The dependence of SPR wavelengths on the spheroid aspect ratio is illustrated in Fig. 5. It is worth noting that in Fig. 5, the electron scattering at the surface of the spheroid is not taken into consideration, i.e. the size of the spheroid is not accounted for.

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.