Nanoscale coherent acoustic phonon imaging

Brian C. Daly, Julien Klein, Theodore B. Norris, Stanley Pau, Donald M. Tennant, Joseph A. Taylor, John E. Bower

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


An ultrafast optical pump and probe technique known as picosecond ultrasonics is used to generate and detect coherent acoustic phonon pulses in nanostructured films grown on Si wafers. By detecting the phonons after they have diffracted across a millimeter thick wafer, it is possible to measure the scattered phonons in the acoustic far field. Numerical backpropagation algorithms can then be used in order to reconstruct the object which scattered the acoustic phonon pulses. We describe measurements and simulations of experiments performed on surface and sub-surface nanostructures. Results with ∼500 nm image resolution are shown, and plans for improving that resolution by an order of magnitude will be described.

Original languageEnglish (US)
Title of host publicationUltrafast Phenomena in Semiconductors and Nanostructure Materials X
StatePublished - 2006
EventUltrafast Phenomena in Semiconductors and Nanostructure Materials X - San Jose, CA, United States
Duration: Jan 23 2006Jan 25 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherUltrafast Phenomena in Semiconductors and Nanostructure Materials X
Country/TerritoryUnited States
CitySan Jose, CA


  • Acoustic phonons
  • Coherent phonons
  • Nanoscale imaging
  • Nanostructures
  • Picosecond ultrasonics
  • Pump-probe spectroscopy
  • Thin films
  • Time-domain spectroscopy
  • Ultrafast optics
  • Ultrasound

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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