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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper QThA4

Temperature dependence of femtosecond thermoreflectivity of thin gold films

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Abstract

Time-resolved thermomodulation has been used to study hot-electron decay and transport in metals and superconductors.1 In these experiments, a femtosecond laser creates hot electrons, and an appropriately delayed probe laser pulse is used to measure the modulation to the sample reflectivity or transmissivity, which is typically attributed to changes in the occupancy of states near the Fermi level resulting from electron heating.2,3 When the decay time of the thermomodulation signal is interpreted to have a qualitative agreement with the hot-electron decay time (inelastic lifetime), good agreement with theoretical values of the electron-phonon coupling for metals heated from 300 K is obtained.4

© 1991 Optical Society of America

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