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O: Fachverband Oberflächenphysik

O 14: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy

O 14.7: Talk

Monday, March 18, 2024, 16:45–17:00, MA 042

Emission from propagating Bloch surface wave polaritons — •Sebastian Henn, Andreas Müller, Marius Grundmann, and Chris Sturm — Felix-Bloch-Institut für Festkörperphysik, Fakultät für Physik und Erdsystemwissenschaften, Uni Leipzig, Leipzig, Deutschland

Bloch surface waves (BSW) correspond to photonic modes propagating along the interface between a dielectric multilayer and the ambient. Due to their evanescent field on both sides of the surface they cannot couple to the electromagnetic far-field of the ambient yielding high lateral propagation lengths in the surface plane. This can be exploited to obtain long-range polaritons by strongly coupling BSW to excitons. In this contribution we demonstrate emission from propagating exciton-polariton states in ZnO. They are detected by diffractive out-coupling using line gratings, produced by electron-beam lithography, in the sample surface. By means of Fourier-imaged photoluminescence we are able to investigate the influence of the grating geometry on the emission behaviour and show propagation lengths of up to 30 µm for states of the lower polariton branch. This is makes Bloch surface wave polaritons interesting for on-chip polaritonic applications.

Keywords: Exciton-Polariton; Bloch surface wave; photoluminescence; diffraction gratings