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Title: Pump-probe imaging of laser-induced periodic surface structures after ultrafast irradiation of Si

Ultrafast pump-probe microscopy has been used to investigate laser-induced periodic surface structure (LIPSS) formation on polished Si surfaces. A crater forms on the surface after irradiation by a 150 fs laser pulse, and a second, subsequent pulse forms LIPSS within the crater. Sequentially delayed images show that LIPSS with a periodicity slightly less than the fundamental laser wavelength of 780 nm appear on Si surfaces ∼50 ps after arrival of the second pump laser pulse, well after the onset of melting. LIPSS are observed on the same timescale as material removal, suggesting that their formation involves material ejection.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109 (United States)
  2. Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109 (United States)
  3. Sandia National Laboratories, Albuquerque, New Mexico 87123 (United States)
  4. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)
Publication Date:
OSTI Identifier:
22217937
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 14; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BEAMS; IMAGES; IRRADIATION; LASERS; MELTING; OPTICAL MICROSCOPY; OPTICAL PUMPING; PERIODICITY; PROBES; PULSES; PUMPS; SEMICONDUCTOR MATERIALS; SILICON; SURFACES; WAVELENGTHS