68 citations · 221 across the 5 of their papers we have counts for
5 papers
Picolitre viscometry using optically rotated particles
Simon J. Parkin, Gregor Knoener, Timo A. Nieminen +2
Important aspects in the field of microrheology are the studies of the viscosity of fluids within structures with micron dimensions and fluid samples where only microlitre volumes…
Forces from highly focused laser beams: modeling, measurement and application to refractive index measurements
G. Knoener, S. Parkin, T. A. Nieminen +2
The optical forces in optical tweezers can be robustly modeled over a broad range of parameters using generalsed Lorenz-Mie theory. We describe the procedure, and show how the comb…
Measurement of refractive index of single microparticles
Gregor Knoener, Simon Parkin, Timo A. Nieminen +2
The refractive index of single microparticles is derived from precise measurement and rigorous modeling of the stiffness of a laser trap. We demonstrate the method for particles of…
Measurement of the total optical angular momentum transfer in optical tweezers
Simon Parkin, Gregor Knoener, Timo A. Nieminen +2
We describe a way to determine the total angular momentum, both spin and orbital, transferred to a particle trapped in optical tweezers. As an example an LG02 mode of a laser beam…
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…