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

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 0.6J/cm2. The developed approach can be employed to control the anisotropy of the glass-metal composites

Dopants

The applicability of XAFS to the structural study of dilute atoms is one of its main characteristics. It has been used extensively to study dopants in semiconductors, providing in many cases a structural basis for the understanding of physical properties. After a brief introduction to the use of XAFS in this field a review of the literature will be presented, ranging from the pioneering studies of As in amorphous Si to recent investigations on semiconductor systems of current interest