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Title: Time-resolved X-ray diffraction studies of laser-induced acoustic wave propagation in bilayer metallic thin crystals

Phonon propagation across the interface of a Cu/Ag(111) bilayer and transient lattice disorder, induced by a femtosecond 267 nm pulse, in Ag(111) crystal have been measured by means of time resolved X-ray diffraction. A “blast” force due to thermal stress induced by suddenly heated electrons is formed within two picoseconds after excitation and its “blast wave” propagation through the interface and Ag (111) crystal was monitored by the shift and broadening of the rocking curve, I vs. ω, as a function of time after excitation. Lattice disorder, contraction and expansion as well as thermal strain formation and wave propagation have also been measured. The experimental data and mechanism proposed are supported by theoretical simulations.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics and Astronomy, Western Kentucky University, Bowling Green, Kentucky 42101 (United States)
  2. Research Center for Applied Sciences Academia Sinica, Taipei, Taiwan (China)
  3. Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)
  4. Department of Electrical and Computer Engineering, Texas A and M University, College Station, Texas 77843 (United States)
Publication Date:
OSTI Identifier:
22314376
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CRYSTALS; EXCITATION; INTERFACES; LASERS; LAYERS; NEUTRON DIFFRACTION; PHONONS; PULSES; SIMULATION; SOUND WAVES; STRAINS; THERMAL STRESSES; TIME DEPENDENCE; TIME RESOLUTION; TRANSIENTS; X-RAY DIFFRACTION