Twin optical traps for two-particle cross-correlation measurements: Eliminating cross-talk

M. Atakhorrami, K. Addas, C. Schmidt

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Abstract

The correlated motions of two micron-sized particles reflect the (micro-) rheological properties of a fluid and can be conveniently detected using two optical traps in combination with interferometric displacement detection. When the correlations become small, cross-talk between the two beams becomes important. We have used dual optical traps created by either two orthogonally polarized laser beams derived from one laser source, or by two independent lasers of different wavelengths for microrheology experiments. High numerical aperture lenses (objective and condenser) in the optical path can introduce depolarization, and polarizing beam splitters are not perfect, both of which can lead to optical cross-talk. We have characterized the cross-talk in our setup and demonstrate that the use of two independent laser eliminates cross-talk entirely. © 2008 American Institute of Physics.
Original languageEnglish
JournalReview of Scientific Instruments
Volume79
Issue number4
DOIs
Publication statusPublished - 2008

Bibliographical note

Twin optical traps for two-particle cross-correlation measurements: Eliminating cross-talk

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