Probing medium-range structural correlations by fluctuation microscopy

Michael Treacy, D. Kumar, A. Rougée, G. Zhao, P R Buseck, I. McNulty, L. Fan, C. Rau, J. M. Gibson

Research output: Contribution to journalArticle

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Abstract

We outline recent advances in the fluctuation microscopy technique for probing medium-range structural correlations in disordered materials. The technique was originally developed for electron microscopy, but has now been extended to optical and x-ray microscopies. We show that fluctuation microscopy can detect trace quantities of C60 in a disordered graphite matrix, even though the diffraction signature from the C60 is essentially undetectable. This result indicates that the technique can be used to discern dilute distributions of macromolecules in an otherwise disordered matrix. We also report preliminary studies of interferometric fluctuation microscopy using cross-correlations in diffraction between coherent double probes. This is a form of holography where the diffraction patterns from two neighboring regions are allowed to overlap and interfere. Young's fringes appear wherever both regions scatter strongly. The cross-correlation can be examined as a function of probe separation to estimate a structure correlation length. This method holds much promise for studying medium-range order, since it isolates the essential four-body terms underpinning the fluctuation microscopy technique.

Original languageEnglish (US)
Article number455201
JournalJournal of Physics Condensed Matter
Volume19
Issue number45
DOIs
StatePublished - Nov 14 2007

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Microscopic examination
microscopy
cross correlation
Diffraction
Graphite
probes
Holography
matrices
Macromolecules
diffraction
macromolecules
holography
Diffraction patterns
Electron microscopy
electron microscopy
diffraction patterns
graphite
signatures
X rays
estimates

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Probing medium-range structural correlations by fluctuation microscopy. / Treacy, Michael; Kumar, D.; Rougée, A.; Zhao, G.; Buseck, P R; McNulty, I.; Fan, L.; Rau, C.; Gibson, J. M.

In: Journal of Physics Condensed Matter, Vol. 19, No. 45, 455201, 14.11.2007.

Research output: Contribution to journalArticle

Treacy, Michael ; Kumar, D. ; Rougée, A. ; Zhao, G. ; Buseck, P R ; McNulty, I. ; Fan, L. ; Rau, C. ; Gibson, J. M. / Probing medium-range structural correlations by fluctuation microscopy. In: Journal of Physics Condensed Matter. 2007 ; Vol. 19, No. 45.
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