Decoupling conservative forces and hydrodynamic interactions between optically trapped spheres

Roman Kreiserman, Omri Malik, Kaplan Ariel

Research output: Contribution to journalArticlepeer-review


Characterizing the interactions between colloidal particles is important, both from a fundamental perspective as well as due to its technological importance. However, current methods to measure the interaction forces between two colloids have significant limitations. Here we describe a method that exploits the fluctuation spectra of two optically trapped microspheres in order to extract, and decouple, the conservative forces acting between them and their hydrodynamic coupling. We demonstrate the proposed method with two silica microspheres, and find good agreement between our results and previous predictions for the hydrodynamic and electrostatic interactions between the spheres.

Original languageEnglish
Article number012611
JournalPhysical Review B (Condensed Matter) (United States)
Issue number1
StatePublished - 24 Jan 2019

All Science Journal Classification (ASJC) codes

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


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