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

S Chervinskii,D V Karpov,P G Kazansky,A A Lipovskii,R Drevinskas,M Beresna,Yu P Svirko

doi:10.1038/srep13746

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.

Highlights

Reflection spectra, the problem of revealing the nanoparticles aspect ratio from the linear dichroism of the laser processed glass-metal nanocomposites (GMNs) is still unresolved
We report an investigation of the linear dichroism spectra of silver-based GMN irradiated with intense femtosecond laser pulses at a wavelength of 515 nm
The linear dichroism originates from the splitting of the surface plasmon resonance (SPR) when spherical silver nanoparticles are elongated by the femtosecond laser irradiation[2]

Summary

Introduction

Reflection spectra, the problem of revealing the nanoparticles aspect ratio from the linear dichroism of the laser processed GMN is still unresolved. We report an investigation of the linear dichroism spectra of silver-based GMN irradiated with intense femtosecond laser pulses at a wavelength of 515 nm. Using an effective media approximation for ellipsoidal inclusions[17], we analyze the measured differential transmission spectra for the light polarized parallel (s) and perpendicular (p) to the polarization azimuth of the femtosecond laser beam used for the GMN modification, and depict the dependence of the aspect ratio of nanoparticles in laser-exposed GMN on the processing conditions

Methods

Results

Discussion

Conclusion