Direct optical observations of surface thermal motions at sub-shot noise levels

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We measure surface thermal fluctuation spectra of liquids, solids, complex fluids, and biological matter using reflected light measurements down to ∼ 10-17 rad2 /Hz in inclinations or ∼ 10-29 m2 /Hz in vertical displacement. The random thermal fluctuations are delineated from random noise at sub-shot noise levels. The principle of the measurement is not limited to surface measurements. The dynamical evolution of the surface properties is also investigated. The measurement time is short, passive, and applicable to a wide variety of surfaces.

Original languageEnglish
Article number020602
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Issue number2
Publication statusPublished - 2009 Aug 19


ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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