Dispersive coupling between MoSe2 and a zero-dimensional integrated nanocavity

Abstract

Establishing a coherent interaction between a material resonance and an optical cavity is a necessary first step for the development of semiconductor quantum optics. Here we demonstrate a coherent interaction between the neutral exciton in monolayer MoSe2 and a zero-dimensional, small mode volume nanocavity. This is observed through a dispersive shift of the cavity resonance when the exciton-cavity detuning is decreased, with an estimated exciton-cavity coupling of ∼ 4.3 meV and a cooperativity of C ∼ 3.4 at 80 K. This coupled exciton-cavity platform is expected to reach the strong light-matter coupling regime (i.e., with C ∼ 380) at 4 K for applications in quantum or ultra-low power nanophotonics.

Optimal condition to probe strong coupling of two-dimensional excitons and zero-dimensional cavity modes

“…The dimensions are identical to the cavity found in an experimental dispersive coupling result. 32 Appendix C: Input-Output Formalism…”

“…While this formalism can be applied to any extended 2D coherent media in confined cavity geometries, we illustrate this result assuming parameters appropriate for a MoSe 2 monolayer deposited on a SiN nanobeam cavity, because such a system can be readily fabricated in practice. 32 Using a finite difference time domain (FDTD) electromagnetic solver (from Lumerical-Ansys), we calculate the cavity field profile (Fig. 1b) to be used into Eq.…”

“…Note that, we experimentally observed a similar reduction in cavity transmission in our exciton-cavity system. 32 The difficulty of demonstrating high transmission efficiency of the cavity mode near zero exciton-cavity detuning stems from the lack of impedance matching between the loss of the hybridized polariton mode and waveguide-coupled loss. As long as the exciton loss is significantly greater than the cavity loss κ + γ, then we can modify the waveguide-coupled loss to our advantage in measuring the transmission spectrum.…”