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O: Fachverband Oberflächenphysik

O 49: Plasmonics and Nanooptics I: Fabrication and Application

O 49.7: Vortrag

Mittwoch, 29. März 2023, 12:00–12:15, WIL A317

Optical grating couplers for the excitation of Bloch surface waves — •Sebastian Henn, Marius Grundmann, and Chris Sturm — Universität Leipzig, Faculty of Physics and Earth Sciences, Felix Bloch Institute for Solid State Physics, Linnéstr. 5, 04103 Leipzig, Germany

In this contribution we demonstrate experimentally the control of the propagation of Bloch Surface Waves (BSW) in the transparent spectral range. BSW exist along the interface of a distributed Bragg reflector (DBR) with a thin top layer of a specified thickness to the ambient. Using shallow optical diffraction gratings with a sub-micron lattice constant, incident light is coupled into and out of the Bloch modes, which propagate along the surface between the gratings. The low-loss nature of evanescent BSW leads to long-range lateral propagation, on the order of micrometers, making this an interesting candidate for on-chip devices, for example by coupling to excitons, i.e. exciton-polariton applications. We give an overview of the fabrication processes as well as the results regarding the optical excitation of BSW by means of imaging ellipsometry, which is supported by rigorous coupled-wave analysis modelling.