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Q: Fachverband Quantenoptik und Photonik
Q 40: Poster – Photonics
Q 40.8: Poster
Wednesday, March 4, 2026, 17:00–19:00, Philo 1. OG
Polarization measurements of nanophotonic outcouplers for quantum technology applications — •Nasimalsadat Mousavi Savadkouhi1, Carl-Frederik Grimpe2, Guochun Du2, Steffen Sauer1,3, Anastasiia Lüßmann-Sorokina1,3, Afonso Alcape Meyer1,3, Liam Shelling Neto1,3, Elena Jordan2, Tanja E. Mehlstäubler2,4,5, and Stefanie Kroker1,2,3 — 1Institut für Halbleitertechnik, Technische Universität Braunschweig, Germany — 2Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 3Laboratory for Emerging Nanometrology, Braunschweig, Germany — 4Institut für Quantenoptik, Leibniz Universität Hannover, Germany — 5Laboratorium für Nano- und Quantenengineering, Hannover, Germany
Controlling the polarization state of light is crucial for photonic and quantum optical applications, such as cooling and state preparation of ions for quantum computing and quantum sensing. Integrated nanophotonic outcouplers provide an on-chip interface for directing light fields onto these quantum emitters, making their ability to generate well-defined circular polarization important. In this work, we investigate the polarization of light emitted from an outcoupler at 760 nm based on a QR-Code structure. We use a rotating quarter-wave plate method to characterize the polarization state, reconstruct the set of Stokes parameters, and obtain the degree of linear and circular polarization of the outcoupled beam. We demonstrate that this measurement method enables verification of the circular polarization by the outcoupler and allows quantification of polarization imperfections.
Keywords: Circular polarization; Nanophotonic outcoupler; Stokes parameters