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Polygonal micro-whirlpools induced in ferrofluids

Bacia M, Lamperska W, Masajada J, Drobczynski S, Marc M

Optica Applicata

2015

Vol. 45, nr 3

309--316

We report on the observation of the polygonal whirlpools in the thin layer of ferrofluid under illumination with a laser beam carrying optical vortex and in the presence of a vertical magnetic field. This kind of structures have attracted attention after discovering a hexagonal storm in Saturn’s atmosphere. Our polygonal whirlpools were created in a closed system (no free surfaces) in micro-scale (whirlpool diameter <20 μm) by the use of holographic optical tweezers. The polygonal shape was changed by varying the magnetic field strength or value of the optical vortex topological charge.

Spectral analysis by a video camera in a holographic optical tweezers setup

Drobczynski S, Dus-Szachniewicz K, Symonowicz K., Glogocka D

Optica Applicata

2013

Vol. 43, nr 4

739--746

We discuss the basic parameters of the holographic tweezers equipped with a diode laser and cheap video camera. We compare these parameters with the system using a fast camera and high power Nd:YAG laser. The measured parameters are: the power spectra density calculated from tracing the position of the micron polystyrene beads and the trap stiffness. We show that this cheap optical tweezers system is sufficient for experiments in microbiology.