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Research Highlight | Argonne National Laboratory

Taking measure of hot carrier populations

In a recent study published in Nature Communications, researchers at the Center for Nanoscale Materials used lasers to irradiate a plasmonic system of gold over glass to better understand the behavior of ultrafast nonthermal and thermal carriers.

Scientific achievement

We obtained the distribution and dynamics of hot carriers (electrons) in a thin film by relating changes in the film’s reflectivity during pulsed laser experiments to known electronic information.

Significance and impact

This study provides a more direct measure of the evolution of hot carrier populations in a metal system —enhancing our fundamental understanding of the non-equilibrium dynamics of electrons. 

Changes in the hot carrier energy distribution as a function of time for a 30nm thick gold film after an initial pulsed excitation show how a non-thermal electronic population relaxes in time. (Image by Argonne National Laboratory.)

Research details

  • A tunable pulsed laser measured reflectivity of a 30 nm-thin gold film on top of a glass substrate as a function of time and probe frequencies; data were then inverted to obtain the underlying hot carrier distribution.
  • Ultrafast transient absorption spectroscopy was performed at the Center for Nanoscale Materials.

DOIhttps://​doi​.org/​10​.​1038​/​s​41467​-​018​-​04289-3

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About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://​sci​ence​.osti​.gov/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​-​a​t​-​a​-​G​lance.

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