Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Optics II

Q 48.2: Vortrag

Donnerstag, 14. März 2019, 10:45–11:00, S Ex 04 E-Tech

Counter propagating OAM carrying light structures for novel optical trapping geometries — •Jan Stegemann, Valeriia Bobkova, Ramon Runde, and Cornelia Denz — University of Muenster, Correnstr. 2, 48149 Muenster, Germany

Within the last years, structuring light fields in a complex way has become a topic of particular interest for implementations in quantum optics, cold gases, information optics and for optomechanical particle trapping. Using fast, computer driven devices with high resolution, as e.g. liquid crystal-based spatial light modulators it is possible to tailor all degrees of freedom of light, namely amplitude, phase and polarization, and also allow for dynamic applications of structured light. A dynamic complex light modulation for optical trapping of special interest is the transfer of optical angular momentum (OAM) to matter since it allows for rotary motion. In this work, we suggest and demonstrate a novel OAM carrying beam structure, which contains two counter rotating transverse of OAM carrying Laguerre-Gaussian beams with different radii and investigate its properties for particle trapping at the example of nanoscale silica beads. Transfer of OAM induces their rotation. Thus, the forces, which induce the rotation of the particles caused by OAM, are pointing in the opposite directions for inner and outer rings. Experimentally, we employ advanced holographical beam shaping by phase-only spatial light modulation. We investigate the potential application of such a light structures for e.g. nanoscale particle sorting by size.