Measuring storage and loss moduli using optical tweezers: broadband microrheology

Abstract

We present an experimental procedure to perform broadband microrheological measurements with optical tweezers. A generalised Langevin equation is adopted to relate the time-dependent trajectory of a particle in an imposed flow to the frequency-dependent moduli of the complex fluid. This procedure allows us to measure the material linear viscoelastic properties across the widest frequency range achievable with optical tweezers.

5 pages, 3 figures

References in corpus (2)

• Calibration of optical tweezers with positional detection in the back-focal-plane
• Direct conversion of rheological compliance measurements into storage and loss moduli

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