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Title: Utilizing dynamic laser speckle to probe nanoscale morphology evolution in nanoporous gold thin films

Here we show the use of dynamic laser speckle autocorrelation spectroscopy in conjunction with the photothermal treatment of nanoporous gold (np-Au) thin films to probe nanoscale morphology changes during the photothermal treatment. Utilizing this spectroscopy method, backscattered speckle from the incident laser is tracked during photothermal treatment and both the characteristic feature size and annealing time of the film are determined. These results demonstrate that this method can successfully be used to monitor laser-based surface modification processes without the use of ex-situ characterization.
 [1] ;  [2] ;  [3] ;  [3] ;  [2]
  1. Univ. of California, Davis, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Davis, CA (United States). Dept. of Electrical Engineering
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC52-07NA27344; 15-ERD-037; CBET-1512745; CBETDMR-1454426; DGE-1148897; 12-LR-237197
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1094-4087
Optical Society of America (OSA)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
Country of Publication:
United States
36 MATERIALS SCIENCE; laser materials processing; subwavelength structures; nanostructures; scattering, rough surfaces; spectroscopy, speckle; process monitoring and control; surface dynamics