Single-particle colloid tracking in four dimensions

Stephen M. Anthony, Liang Hong, Minsu Kim, Steve Granick

Research output: Contribution to journalArticlepeer-review


Coating a close-packed fluorescent colloid monolayer with a nanometer-thick metal film followed by sonication in liquid produces modulated optical nanoprobes. The metal coating modulates the fluorescence as these structures rotate in suspension, enabling the use of these particles as probes to monitor both rotational and center-of-mass (translational) dynamics in complex environments. Here, we demonstrate methods to simultaneously measure two translational and two rotational degrees of freedom, with excellent agreement to theory. The capability to determine two angles of rotation opens several new avenues of future research.

Original languageEnglish (US)
Pages (from-to)9812-9815
Number of pages4
Issue number24
StatePublished - Nov 21 2006

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry


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