Optical microrheology using rotating laser-trapped particles
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We demonstrate an optical system that can apply and accurately measure the torque exerted by the trapping beam on a rotating birefringent probe particle. This allows the viscosity and surface effects within liquid media to be measured quantitatively on a micron-size scale using a trapped rotating spherical probe particle. We use the system to measure the viscosity inside a prototype cellular structure.
5 pages, 4 figures. v2: bibliographic details, minor text corrections
5 pages, 4 figures. v2: bibliographic details, minor text corrections