Polarized and Directional Single-Photon Emission in WSe₂ Enhanced by q-BIC Nanoantennae

Atomically thin transition metal dichalcogenides (TMDs) are promising platforms for quantum photonics owing to their ability to host strain-induced single-photon emitters (SPEs) that can be integrated with photonic nanostructures. However, the typically random polarization and near-isotropic emission of these emitters present challenges for controlled photon routing and photonic integration. Here, we demonstrate polarized and directional single-photon emission from WSe₂ coupled to an all-dielectric nanoantenna supporting a quasi-bound state in the continuum (q-BIC). Relative to off-antenna emitters, antenna-coupled emitters exhibit similar linear polarization and modified far-field radiation patterns. Time-resolved photoluminescence measurements indicated an effective Purcell factor of ∼10, consistent with coupling to the q-BIC mode. Together, these results demonstrate that q-BIC nanoantennae provide an effective approach for engineering the polarization, emission direction, and radiative dynamics of TMD-based SPEs, offering a pathway toward engineered emitter-photon interfaces in integrated quantum photonic systems.