22 citations · 32 across the 4 of their papers we have counts for
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T-matrix calculation via discrete-dipole approximation, point matching and exploiting symmetry
Vincent L. Y. Loke, Timo A. Nieminen, N. R. Heckenberg +1
We present a method of incorporating the discrete dipole approximation (DDA) method with the point matching method to formulate the T-matrix for modeling arbitrarily shaped micro-s…
Symmetry and the generation and measurement of optical torque
Timo A. Nieminen, Theodor Asavei, Vincent L. Y. Loke +2
A key element in the generation of optical torque in optical traps, which occurs when electromagnetic angular momentum is transferred from the trapping beam to the trapped particle…
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…
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…