Extended Data Fig. 3: Calculations of the photon collection efficiency by a NA=0.85 objective.
From: Single artificial atoms in silicon emitting at telecom wavelengths

a, Scheme of the simulated structure. The emitter dipole is assumed to be lying in the plane perpendicular to the surface, as this configuration maximizes photon collection. b, Evolution of the collection efficiency ηcoll as a function of the depth d of the embedded emitter.