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X-ray four-wave mixing: Transient grating measurements of nano-scale thermo-elastic responses. F. Hofmann , K.A . Nelson. Key points: TG in optical range has been used to study coherent phonons and thermal transport To move to nano-scale need to reduce grating period and hence the wavelength

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X-ray four-wave mixing: Transient grating measurements of nano-scale thermo-elastic responses

F. Hofmann, K.A. Nelson

  • Key points:
  • TG in optical range has been used to study coherent phonons and thermal transport
  • To move to nano-scale need to reduce grating period and hence the wavelength
  • LCLS provides unique opportunity
  • –> coherence and time resolution
  • Experimental requirements
  • –> split and delay of pump and probe
  • –> generation of overlapping beams
  • Generalized non-linear X-ray spectroscopy

Transient grating

Transient grating generation

Johnson et al. J. Appl. Phys. 110, 113513 (2011)

Coherent phonons & thermal grating decay

X-ray pump-probe splitting

sample

x-ray gratings

signal

Ti film on Si substrate, 0.76μm grating period

Rogers et al.Annu. Rev. Mater. Sci. 30:117–57 (2000)

Decane with alumina nanoparticles

Schmidt et al. J. App. Phys. 103, 083529 2008

Heilmann et al. Optics Express 16, 8658 (2008)

Roseker et al. Optics Letters 34 (12) 2009