1k citations · 1.9k across the 12 of their papers we have counts for
12 papers
Angular momentum of a strongly focussed Gaussian beam
Timo A. Nieminen, Norman R. Heckenberg, Halina Rubinsztein-Dunlop
A circularly polarized rotationally symmetric paraxial laser beams carries hbar angular momentum per photon as spin. Focussing the beam with a rotationally symmetric lens cannot ch…
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…