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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…
Refractometry of organosilica microspheres
Katrina Y. T. Seet, Robert Vogel, Timo A. Nieminen +4
The refractive index of novel organosilica (nano/micro)material is determined using two methods. The first method is based on analysis of optical extinction efficiency of organosil…
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…
Nanotrapping and the thermodynamics of optical tweezers
W. Singer, T. A. Nieminen, N. R. Heckenberg +1
Particles that can be trapped in optical tweezers range from tens of microns down to tens of nanometres in size. Interestingly, this size range includes large macromolecules. We sh…
Optical trapping of a cube
A. M. Branczyk, T. A. Nieminen, N. R. Heckenberg +1
The successful development and optimisation of optically-driven micromachines will be greatly enhanced by the ability to computationally model the optical forces and torques applie…
Collecting single molecules with conventional optical tweezers
Wolfgang Singer, Timo A. Nieminen, Norman R. Heckenberg +1
The size of particles which can be trapped in optical tweezers ranges from tens of nanometres to tens of micrometres. This size regime also includes large single molecules. Here we…