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Nano-FTIR spectroscopy reveals SiO2 densification within fs-laser induced nanogratings

  • 0Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Saclay, CNRS Bât. 410 91405 Orsay France nadezhda.shchedrina@universite-paris-saclay.fr.
Nanoscale Advances +

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September 9, 2024

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September 9, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Femtosecond laser inscriptions in glass create nanogratings. This study provides nanoscale evidence of densification within these laser tracks, revealing complex structural changes in silica glass.

Area Of Science

  • Materials Science
  • Nanotechnology
  • Laser Physics

Background

  • Femtosecond (fs) laser inscriptions induce structural modifications in glass, including type II nanogratings vital for optical and photonic applications.
  • Understanding the densification mechanisms within these laser-induced tracks is crucial for optimizing material properties.

Purpose Of The Study

  • To investigate the nanoscale structural transformations in fs-laser inscribed glass, specifically focusing on type II nanogratings.
  • To provide direct nanoscale evidence of densification mechanisms within laser-modified glass.
  • To explore the interplay between different types of laser-induced modifications.

Main Methods

  • Utilizing scattering-type scanning near-field optical microscopy (s-SNOM) for high-resolution imaging of laser tracks.
  • Employing synchrotron radiation nanoscale Fourier-transform infrared spectroscopy (nano-FTIR) to analyze chemical and structural changes at the nanoscale.
  • Characterizing the infrared (IR) vibrational structural bands of silica glass within the laser-inscribed regions.

Main Results

  • Direct nanoscale evidence of densification within fs-laser inscribed tracks was observed.
  • The densification was linked to high-pressure, high-temperature (HP-HT) conditions induced by the laser.
  • A significant shift in the main IR vibrational band of silica glass confirmed the structural changes.
  • A complex interplay between type I and type II modifications was identified.

Conclusions

  • The study presents the first direct nanoscale evidence of HP-HT-driven densification in fs-laser inscribed tracks.
  • The findings enhance the understanding of structural transformations and densification mechanisms in laser-modified silica glass.
  • The results contribute to the development of advanced optical and photonic devices utilizing laser-inscribed nanostructures.