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HL: Fachverband Halbleiterphysik

HL 2: 2D Materials and Heterostructures: Photonic Aspects

HL 2.4: Vortrag

Montag, 18. März 2024, 10:15–10:30, EW 201

Interaction of 2D materials with laser-written waveguide circuits — •Alina Schubert¹, Karo Becker¹, Marco Kirsch¹, Jakob Kuhlke¹, Rico Schwartz¹, Andreas Thies², Alexander Szameit¹, Matthias Heinrich¹, and Tobias Korn¹ — ¹Institut für Physik, Universität Rostock, 18059 Rostock, Germany — ²Ferdinand Braun Institut, Leibnitz Institut für Höchstfrequenztechnik, 12489 Berlin, Germany

The remarkable optical properties of monolayer transition metal dichalcogenides (TMDCs) are determined by strongly bound excitons. Currently, most of the micro-photoluminescence measurements are performed with light polarized in the plane of the TMDC layer. However, so-called dark excitons that emit z-polarized light propagating along the TMDC layer require detection from the side [1, 2].

Our intention is to probe TMDCs in this direction by depositing them onto a fused silica glass substrate containing femtosecond laser direct written waveguides [3]. By defining the waveguide near the surface of the glass, interactions of the waveguide’s evanescent field and the TMDC are enabled.

Our micro-photoluminescence setup that couples into the waveguides and simultaneously detects light perpendicular to the TMDC layer has the potential to excite and detect the x,y and z polarization of the PL signal, allowing for direct observations of dark excitons.

[1] X.-X. Zhang et al., Phys. Rev. Lett., 115 (2015).

[2] G. Wang et al., Phys. Rev. Lett., 119 (2017).

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

Keywords: 2D materials; TMDC; exciton; waveguide