Integration of single layer MoSe2 with photonic rings for electrically switchable routing of light

Semiconducting transition metal dichalcogenide monolayers exhibit pronounced optical signatures in the visible and near-infrared regimes due to strong excitonic resonances, which can be modulated significantly through electrostatic doping. When interfaced with such tunable dielectric environments, nanophotonic devices inherit gate-dependent functionalities. Here, we demonstrate an electro-optical switch composed of a titanium dioxide ring resonator fabricated on monolayer molybdenum diselenide. Gate-varying measurements reveal electrically tunable cavity transmission, suggesting future application in on-chip photonic circuitry.