Confocal scanning acoustic microscopy in air at normal conditions at frequencies close to the phonon cut-off regime

T. J. Kim, Z. Kojro, M. Pluta, M. Schmachtl, M. Schubert, T. Gudra, W. Grill

Research output: Contribution to journalConference article

5 Scopus citations

Abstract

A scanning acoustic microscope with phase and amplitude contrast (vector contrast) operating in air at normal conditions has been developed. Focusing transducers with and without impedance matching layers were manufactured and employed for the generation and spatially resolved detection of reflected or transmitted ultrasonic waves. Frequencies up to 11 MHz have been successfully employed. At 1.27 MHz a lateral resolution of about 220 μm is achieved. The distance resolution reaches 3 nm for 3 s total acquisition time in this case. It is in the vicinity of the average distance between the molecules in air at normal conditions. At 5 MHz a lateral resolution of about 60 μm was measured. Theoretical modelling of the focusing properties of the spherical transducer has been performed.

Original languageEnglish (US)
Pages (from-to)588-594
Number of pages7
JournalPhysica B: Condensed Matter
Volume263-264
DOIs
StatePublished - Mar 1999
EventProceedings of the 1998 9th International Conference on Phonon Scattering in Condensed Matter, PHONONS 98 - Lancaster, Great Britain
Duration: Jul 26 1998Jul 31 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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