Abstract
We demonstrate strongly polarized photoluminescence (PL) from Er3+ ions embedded in plasmonic nanocavity arrays, which was reported in our recent paper [Choi et al., Nano Lett. 16, 5191 (2016)]. The precise positioning of the Er3+ layer within the nanocavities with respect to the node and antinode of the electromagnetic field modifies the PL spectral shape and allows linearly polarized emission with a 98% degree of polarization. The observed PL is caused by a single component of the dipole moments in Er3+ emitters and by anisotropically controlled local density of states.
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