  We study, in the framework of entanglement harvesting protocols, the
entanglement harvesting of a pair of uniformly accelerated detectors locally
interacting with vacuum massless scalar fields subjected to a perfectly
reflecting plane boundary. We find that the presence of the boundary generally
degrades the amount of the harvested entanglement when two detectors are very
close to the boundary for all three acceleration scenarios of the detectors
with respect to the boundary, i.e., parallel, anti-parallel and mutually
perpendicular acceleration. However, when the distance between detectors and
the boundary becomes comparable to the interaction duration parameter, the
amount of harvested entanglement may approach a peak, which even goes beyond
that without a boundary. Remarkably, the parameter space of the detectors'
separation and the magnitude of acceleration that allows entanglement
harvesting to occur is enlarged due to the presence of the boundary. In this
sense, the boundary plays a double-edged role on entanglement harvesting,
degrading in general the amount of entanglement while enlarging the
harvesting-achievable parameter space. A comparison of three different
acceleration scenarios shows that the phenomena of entanglement harvesting
crucially depends on the magnitude of acceleration, the separation between two
detectors and the detectors' distance from the boundary.
