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Embodying bosonic and electrically interactive characteristics intwo-dimensional space, excitons in transition-metal dichalcogenides (TMDCs)have garnered considerable attention. The realisation and application ofstrong-correlation effects, long-range transport, and valley-dependentoptoelectronic properties require customising exciton decay dynamics. Strains,defects, and electrostatic doping effectively control the decay dynamics butsignificantly disturb the intrinsic properties of TMDCs, such as electron bandstructure and exciton binding energy. Meanwhile, vacuum-field manipulationprovides an optical alternative for engineering radiative decay dynamics.Planar mirrors and cavities have been employed to manage the light-matterinteractions of two-dimensional excitons. However, the conventional flatplatforms cannot customise the radiative decay landscape in the horizontal TMDCplane or independently control vacuum field interference at different pumpingand emission frequencies. Here, we present a meta-mirror resolving the issueswith more optical freedom. For neutral excitons of the monolayer MoSe2, themeta-mirror manipulated the radiative decay rate by two orders of magnitude,depending on its geometry. Moreover, we experimentally identified thecorrelation between emission intensity and spectral linewidth. The anisotropicmeta-mirror demonstrated polarisation-dependent radiative decay control. Weexpect that the meta-mirror platform will be promising to tailor thetwo-dimensional distributions of lifetime, density, and diffusion of TMDCexcitons in advanced opto-excitonic applications.

Customising radiative decay dynamics of two-dimensional excitons via position- and polarisation-dependent vacuum-field interference