Gold Nanorod Dimer Enhanced Bright and Polarized Single Photons Coupled to Optical Nanowire

ABSTRACT We propose a system for channeling plasmon‐enhanced polarized single photons into optical nanowire‐guided modes. We show that the spontaneous emission properties of quantum emitters can be strongly enhanced in the presence of a gold nanorod dimer, leading to the emission of highly polarized and bright single photons. We numerically calculate the Purcell factor as high as ∼ 19150 and a radiative quantum efficiency of ∼ 0.8. This yields a coupling efficiency of ∼ 13% into the guided modes of the optical nanowire with an enhancement factor of ∼ 1990 and a high degree of polarization of > 99% for fiber‐coupled single photons. We show that the gold nanorod dimer system can yield an order of magnitude enhancement of the spontaneous emission characteristics as compared to a single gold nanorod. This proposed hybrid quantum system can be in line with fiber networks and may open new avenues for quantum information applications.