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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.10: Poster

Mittwoch, 22. März 2023, 17:30–19:00, HSZ EG

Development of a holographic optical trap design — •Christian Theden, Natascha Blosczyk, and Dietmar Block — Institute of Experimental and Applied Physics, Kiel University, Germany

In the research focus of dusty plasmas, a controlled manipulation of dust particle position is considered a major challenge. Especially in the field of binary mixtures, there is great interest in being able to control the positions of the particles to create binary crystals or liquids with periodic particle arrangement. First experiments show that optical tweezers can manipulate single particles in a dusty plasma [1, 2]. The problem here is that only one particle can be moved at a time. This is different for holographic-optical tweezers. Here the basic idea is to generate digitally a hologram and displayed on a spatial light modulator (SLM). Laser illumination of the SLM can create arbitrary light field and thus realize multiple tweezers at once. In this way, several tweezers can be projected at the same time. In addition, the hologram can be varied dynamically. The aim of this work and the first step towards such a powerful device is a single tweezer setup with a SLM. To determine the forces in the plasma that a holographic-optical tweezer exerts on a particle, the radiation pressure and the gradient forces are examined. This allows to develop a trap design and implement the holographic-optical tweezers in a dusty plasma experiment.

[1] V. Schneider, H. Kersten, 2018 Rev. Sci. Instrum. 89

[2] J. Schablinski, F. Wieben and D. Block, 2015 Phys. Plasmas 22