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HL: Fachverband Halbleiterphysik

HL 2: 2D Semiconductors and van der Waals Heterostructures I

HL 2.3: Vortrag

Montag, 17. März 2025, 10:00–10:15, H15

Detecting out-of-plane polarized luminescence in TMDs with laser-written waveguide circuits — •Alina Schubert¹, Karo Becker¹, Rico Schwartz¹, Andreas Thies², Alexander Szameit¹, Matthias Heinrich¹, and Tobias Korn¹ — ¹Institut für Physik, Universität Rostock, Rostock, Germany — ²2Ferdinand Braun Institut, Leibnitz Institut für Höchstfrequenztechnik, Berlin, Germany

Photoluminescence (PL) spectroscopy is used widely to investigate the outstanding excitonic properties of two-dimensional crystals. However, since these measurements are typically performed in vertical incidence, the sample is excited with light polarized in the plane of its layer. Despite, these detection schemes systematically neglect the out-of-plane polarized components of the emitted signal that propagate along the layer and therefore are only accessible by side-on detection.

Here, a side-on detection is achieved by using femtosecond laser direct written waveguides in fused silica glass as substrates [1]. By inscribing the waveguides directly under the surface of the glass, interactions of the waveguide's evanescent field and the sample are enabled in a controlled fashion. Therefore, the sample can be excited due to its proximity to the waveguide, while, in turn, the excitonic emission can be coupled into the waveguide and subsequently be detected.

In this work, the in-plane propagating luminescence in TMDs is analyzed with a particular focus on determining influences on the signal resulting from combining TMDs and surface waveguides.

[1] A. Szameit et al., J. Phys. B.: At. Mol. Opt. Phys., 43 (2010).

Keywords: 2D materials; TMD; waveguide; optical spectroscopy