Abstract
A finite element method is applied to study the coupling between a nitrogen vacancy (NV) single photon emitter in nanodiamond and surface plasmons in a silver nanowire embedded in an alumina nanochannel template. We investigate the effective parameters in the coupled system and present detailed optimization for the maximum transmitted power at a selected optical frequency (650 nm). The studied parameters include nanowire length, nanowire diameter, distance between the dipole and the nanowire, orientation of the emitter and refractive index of the surrounding. It is found that the diameter of the nanowire has a strong influence on the propagation of the surface plasmon polaritons and emission power from the bottom and top endings of the nanowire.
Highlights
Understanding the coupling between a quantum emitter and a waveguide is scientifically and technologically extremely valuable because it provides a flexible bridge between optics and electronics
We have used finite elements method to study the coupling between an optical emitter and a nanowire in an alumina matrix
In this work we have studied the effects of the nanowire length, diameter and material, dipole position, polarization and the refractive index of the surrounding dielectric
Summary
Understanding the coupling between a quantum emitter and a waveguide is scientifically and technologically extremely valuable because it provides a flexible bridge between optics and electronics. Akimov et al [24] have experimentally studied coupling of a single photon emitter to the surface plasmons in a silver nanowire. Despite significant progress in this field in the recent years, a detailed understanding of different factors influencing the transmitted power characteristics and coupling between an optical emitter and a nanowire plasmonic waveguide has not been undertaken to date. We report on a rigorous computational study of the coupling between a quantum emitter and a finite-size vertical silver nanowire embedded in an alumina matrix using a finite elements method. We present a comprehensive description of the effective parameters in a realistic coupled emitter-nanowire system and optimize the system for optimal coupling between the quantum emitter and plasmons in the silver nanowire. Some terms are used interchangeably with regarding the suitability of the context: waveguide for the nanowire and dipole and emitter for the NV center in nanodiamond
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