Abstract
Abstract Due to small optical mode volumes and linear polarizations of surface-plasmon-polariton (SPP) resonant modes in metallic antennas, it is very difficult to obtain complex emission patterns and polarizations for single-photon emitters. Herein, nonresonant enhancement in a silver nanowire is used to both enhance emission rates and extract a z-oriented dipole, and then the symmetry of metallic nanostructures is proposed to tailor the patterns and polarizations of single-photon emission. The emission pattern of a quantum dot located close to a metallic nanostructure with a symmetric axis is split into multiple flaps. The number of splitting flaps is equal to the order of the symmetric axis. Moreover, the electric vectors of the emitted photons become centrally symmetric about the symmetric axis. The above phenomena are well explained by both a simulation and an image dipole model. The structural-symmetry-tailoring mechanism may open up a new avenue in the design of multifunctional and novel quantum-plasmonic devices.
Highlights
Single-photon emitters are of great importance for applications in quantum technologies such as quantum computing, quantum simulation, quantum walk, quantum memory, and precision measurement [1]
When a quantum emitter is located very close to a metallic antenna, the photons emitted from the quantum emitter are mainly coupled to the strong SPP resonant modes rather than directly radiating to free space [19]
We propose to use symmetry of a metallic nanostructure rather than SPP resonant modes to tailor emission patterns and polarizations of a single-photon emitter
Summary
Single-photon emitters are of great importance for applications in quantum technologies such as quantum computing, quantum simulation, quantum walk, quantum memory, and precision measurement [1]. Photons emitted from quantum emitters in these hybrid systems [8,9,10,11,12,13,14,15,16,17,18] are linearly polarized because of linear polarizations of nanoscale SPP resonant modes (e.g., dipole resonance) in metallic antennas, and other polarization states of single-photon emission are difficult to achieve Both of the above issues greatly limit applications of singlephoton emitters in the areas of multiple-degree-of-freedom quantum memory, quantum correlation, quantum lithography, quantum imaging, quantum encoding, and quantum processing [22,23,24,25,26,27,28]. The tailoring of the emission patterns and polarizations of the single quantum dot by the structural symmetry might provide more degrees of freedom and more functionalities in quantum devices [22,23,24,25,26,27,28]
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