A single Eu3+ nanoparticle in a fiber microcavity shows simultaneous Purcell enhancement of two optical transitions, halving the excited-state lifetime and yielding a 3.3 MHz homogeneous linewidth upper bound.
Spontaneous emission probabilities at radio frequencies,
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Multimodal Purcell enhancement and optical coherence of Eu$^{\text{3+}}$ ions in a single nanoparticle coupled to a microcavity
A single Eu3+ nanoparticle in a fiber microcavity shows simultaneous Purcell enhancement of two optical transitions, halving the excited-state lifetime and yielding a 3.3 MHz homogeneous linewidth upper bound.