Design of an efficient single photon source from a metallic nanorod dimer: a quasinormal mode finite-difference time-domain approach

TL;DR

This paper introduces a finite-difference time-domain method to compute quasinormal modes in metallic nanorods, enabling accurate modeling of enhanced photon emission for nanoplasmonic applications.

Contribution

It presents a novel approach combining FDTD with QNM expansion to analyze light-matter interactions in metallic nanostructures.

Findings

Achieved photon emission enhancement factors of around 1500

Obtained large output β-factors of about 60%

Demonstrated the effectiveness of the QNM FDTD approach

Abstract

We describe how the finite-difference time-domain (FDTD) technique can be used to compute the quasinormal mode (QNM) for metallic nano-resonators, which is important for describing and understanding light-matter interactions in nanoplasmonics. We use the QNM to model the enhanced spontaneous emission rate for dipole emitters near a gold nanorod dimer structure using a newly developed QNM expansion technique. Significant enhanced photon emission factors of around 1500 are obtained with large output $\beta$-factors of about $60\%$.