Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 41: Organic Semiconductors 2

HL 41.3: Vortrag

Freitag, 9. September 2022, 10:00–10:15, H34

Optical Vortices in Hemispherical Organic Microcavities — •Johannes Düreth¹, Simon Betzold¹, Marco Dusel¹, Monika Emmerling¹, Jürgen Ohmer², Utz Fischer², Christian Schneider³, Sven Höfling¹, and Sebastian Klembt¹ — ¹Technische Physik, RCCM and Würzburg-Dresden Cluster of Excellence ct.qmat, University of Würzburg, Germany — ²Department of Biochemistry, University of Würzburg, Germany — ³Institute of Physics, University of Oldenburg, Germany

Light can carry two different kinds of angular momentum: spin angular momentum (SAM), which is associated with polarization, and orbital angular momentum (OAM), which occurs in light with spiral phase fronts. In recent years, it has been shown that rotational symmetry of a microcavity systems leads to an effective spin-orbit coupling of the SAM and the OAM of photons, resulting in new polariton eigenstates.

Here, we study helical Laguerre-Gaussian modes LG_{0 ±1}^σ_± formed in such systems. For a total angular momentum of J=0, both eigenstates are radially and azimuthally polarized, respectively. Due to the spatial dependence of the linear polarization, we measure spin vortices for these modes. In contrast, the energetically degenerate modes with J=2 exhibit opposite circular polarization and carry an optical OAM with opposite chirality. Accordingly, phase vortices with opposite sign were measured by polarization-dependent interference measurements.

Moreover, we show that the preservation of pump polarization allows selection of the optical OAM of ±1.