We report an experimental analysis of the surface structures induced on silicon by ?900. fs laser pulses at 1055. nm, both in air and high vacuum conditions. The direct comparison between the results obtained in atmosphere and in high vacuum highlights the influence of ambient pressure in the formation of surface micro-grooves with above-wavelength period. The effect is ascribed to the presence of nanoparticles of the target material on the sample surface when the process is carried out in air. In the case of high vacuum, we have also observed the formation of a peculiar structured region, elliptically shaped, and with the major axis directed along the polarization of the laser beam. These results are particularly interesting to further clarify some of the mechanisms involved in the process of direct ultrashort laser surface structuring.

Direct ultrashort laser surface structuring of silicon in air and vacuum at 1055nm

Fittipaldi R;Vecchione A;Bruzzese R;Amoruso S
2017

Abstract

We report an experimental analysis of the surface structures induced on silicon by ?900. fs laser pulses at 1055. nm, both in air and high vacuum conditions. The direct comparison between the results obtained in atmosphere and in high vacuum highlights the influence of ambient pressure in the formation of surface micro-grooves with above-wavelength period. The effect is ascribed to the presence of nanoparticles of the target material on the sample surface when the process is carried out in air. In the case of high vacuum, we have also observed the formation of a peculiar structured region, elliptically shaped, and with the major axis directed along the polarization of the laser beam. These results are particularly interesting to further clarify some of the mechanisms involved in the process of direct ultrashort laser surface structuring.
2017
Istituto Superconduttori, materiali innovativi e dispositivi - SPIN
Femtosecond laser surface direct structuring
Laser materials processing
Microstructure fabrication
Ripples and grooves
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/356339
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 20
  • ???jsp.display-item.citation.isi??? ND
social impact