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HL: Fachverband Halbleiterphysik

HL 29: Materials and devices for quantum technology I

HL 29.6: Vortrag

Mittwoch, 29. März 2023, 16:45–17:00, POT 151

Coupling of solid-state quantum emitters to low-loss plasmonic waveguides — •Paul Steinmann, Hans-Joachim Schill, and Stefan Linden — Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany

Plasmonic waveguides with integrated single photon emitters (SPEs) offer an attractive platform for nanophotonic quantum circuit applications. Here, we report on the coupling of strain-induced SPEs in an MoSe2 monolayer to low-loss plasmonic waveguides. For this purpose, we used electron beam lithography with the negative-tone resist Medusa82 to fabricate dielectric-loaded surface plasmon polariton waveguides (DLSPPWs) on top of a chemically prepared monocrystalline silver platelet. Additional gratings placed at the ends of the waveguides serve as in- and out-coupling structures. An MoSe2 monolayer was deposited on the centre of one of the waveguides by a dry-transfer technique. Operating at 4 Kelvin, surface plasmon polaritons (SPPs) are launched by a green laser at the in-coupling port of the waveguide. The SPPs travel through the waveguide and lead to the excitation of the monolayer. In addition to the exciton and trion signal, we observe sharp emission lines that we attribute to strain-induced trap states. The second-order correlation function of one of the spectrally filtered emission lines was measured with an HBT setup. The measured value g(2)(0)=0.4 indicates the single-photon nature of the emitter. Our findings indicate that TMDC monolayers can be used as integrated SPEs in efficient plasmonic circuits, and thus further pave the way towards plasmonic-based single photon networks.