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Optical measurement of torque exerted on an elongated object by a non-circular laser beam
Simon J. Parkin, Timo A. Nieminen, Norman R. Heckenberg +1
We have developed a scheme to measure the optical torque, exerted by a laser beam on a phase object, by measuring the orbital angular momentum of the transmitted beam. The experime…
Optical microrheology using rotating laser-trapped particles
Alexis I. Bishop, Timo A. Nieminen, Norman R. Heckenberg +1
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…
Mechanical effects of optical vortices
N. R. Heckenberg, M. E. J. Friese, T. A. Nieminen +1
We concentrate on the forces and torques exerted on transparent and absorbing particles trapped in laser beams containing optical vortices. We review previous theoretical and exper…
Optical trapping of absorbing particles
H. Rubinsztein-Dunlop, T. A. Nieminen, M. E. J. Friese +1
Radiation pressure forces in a focussed laser beam can be used to trap microscopic absorbing particles against a substrate. Calculations based on momentum transfer considerations s…
Optical application and measurement of torque on microparticles of isotropic nonabsorbing material
Alexis I. Bishop, Timo A. Nieminen, Norman R. Heckenberg +1
We show how it is possible to controllably rotate or align microscopic particles of isotropic nonabsorbing material in a TEM00 Gaussian beam trap, with simultaneous measurement of…
Optical alignment and spinning of laser-trapped microscopic particles
M. E. J. Friese, T. A. Nieminen, N. R. Heckenberg +1
Light-induced rotation of absorbing microscopic particles by transfer of angular momentum from light to the material raises the possibility of optically driven micromachines. The p…