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

TL;DR

This paper proposes a novel scheme for creating a tunable, ultranarrow-band single-photon source by coupling a three-level emitter to a one-dimensional waveguide, overcoming previous limitations caused by spontaneous emission losses.

Contribution

The paper introduces a new method using a three-level emitter coupled to a waveguide to achieve narrower spectral widths without loss, advancing plasmonic single-photon source technology.

Findings

Reflective spectrum width can be significantly narrowed.

The scheme avoids loss caused by spontaneous emission.

Potential for ultranarrow plasmonic single-photon sources.

Abstract

The spectrum width can be narrowed to a certain degree by decreasing the coupling strength for the two-level emitter coupled to the propagating surface plasmon. But the width can not be narrowed any further because of the loss of the photon out of system by spontaneous emission from the emitter. Here we propose a new scheme to construct a narrow-band source via a one-dimensional waveguide coupling with a three-level emitter. It is shown that the reflective spectrum width can be narrowed avoiding the impact of the loss. This approach opens up the possibility of plasmonic ultranarrow single-photon source.