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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 1 — Jan. 1, 2013
  • pp: A177–A181

Nanoscale fluctuations and surface tension measurements in droplets using phase-resolved low-coherence interferometry

Ru Wang, Taewoo Kim, Mustafa Mir, and Gabriel Popescu  »View Author Affiliations

Applied Optics, Vol. 52, Issue 1, pp. A177-A181 (2013)

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A common-path interferometer was designed with rapidly tunable broadband swept laser source, which provides quantitative phase measurements of nanometer scale motions with very high sensitivity. With this setup, we are able to detect the thermal fluctuations in liquid droplets hanging at the end of an optical fiber. The measured nanoscale displacement fluctuations of various droplet surfaces were used to extract the surface tension. This newly developed technique proved the feasibility of noninvasive, fast, phase-resolved dynamic light scattering measurement of fluid mechanical properties.

© 2012 Optical Society of America

OCIS Codes
(290.5880) Scattering : Scattering, rough surfaces
(240.3695) Optics at surfaces : Linear and nonlinear light scattering from surfaces
(280.4788) Remote sensing and sensors : Optical sensing and sensors

Original Manuscript: August 16, 2012
Revised Manuscript: October 15, 2012
Manuscript Accepted: October 16, 2012
Published: November 13, 2012

Ru Wang, Taewoo Kim, Mustafa Mir, and Gabriel Popescu, "Nanoscale fluctuations and surface tension measurements in droplets using phase-resolved low-coherence interferometry," Appl. Opt. 52, A177-A181 (2013)

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