Abstract
This paper demonstrates 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.
Highlights
For many decades, laser speckle autocorrelation spectroscopy has continually demonstrated its utility in determining particle size in colloid suspensions as well as characterizing static material surface properties and slow material relaxation processes [1,2,3]
This paper demonstrates the use of dynamic laser speckle autocorrelation spectroscopy in conjunction with the photothermal treatment of nanoporous gold 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
Summary
Laser speckle autocorrelation spectroscopy has continually demonstrated its utility in determining particle size in colloid suspensions as well as characterizing static material surface properties (i.e. roughness) and slow material relaxation processes [1,2,3]. The use of speckle patterns to determine these properties presents an attractive avenue for the precise characterization of surfaces during laser materials processing using the existing sources of energy. In order to successfully integrate speckle autocorrelation spectroscopy into applications of laser surface processing [9,10], it is necessary to investigate the two-dimensional dynamic laser speckle that arises due to laser-induced surface modification. Nanostructured materials present a unique albeit challenging surface to characterize via dynamic speckle autocorrelation spectroscopy. One such nanostructured material that lends itself well to surface morphology modification through laser processing is nanoporous gold. We couple dynamic laser speckle autocorrelation spectroscopy and the photothermal treatment of thin film np-Au to successfully probe both morphology evolution dynamics (length and time) of the films without the use of ex situ microscopy techniques
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