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The spectrum width can be narrowed to a certain degree by decreasing thecoupling strength for the two-level emitter coupled to the propagating surfaceplasmon. But the width can not be narrowed any further because of the loss ofthe photon out of system by spontaneous emission from the emitter. Here wepropose a new scheme to construct a narrow-band source via a one-dimensionalwaveguide coupling with a three-level emitter. It is shown that the reflectivespectrum width can be narrowed avoiding the impact of the loss. This approachopens up the possibility of plasmonic ultranarrow single-photon source.

Tunable narrow band source via the strong coupling between optical emitter and nanowire surface plasmons