Abstract: Single-photon emitters radiate as electric dipoles, which limits light collection efficiency and complicates integration into flatphotonic devices. Developing nanophotonic structures capable of directing photon emission with tunable angular distributionsin the visible spectrum has been pursued for applications ranging from integrated optical systems to discrimination of molecularspecies. To date, such directional control has been achieved using components whose overall footprint is larger than the emissionwavelength and often rely on lossy plasmonic components. Here, we employ the DNA origami technique for deterministicnanoscale assembly, positioning single fluorophores in nanometric proximity to a single silicon spherical nanoparticle (SiNP)and demonstrate unidirectional emission with forward-to-backward intensity ratios up to -7 dB. Furthermore, we show that asingle silicon nanosphere antenna can function as a color router or a beam steerer depending on its size, emitter spectral rangeand emitter-nanoparticle distance, enabling the use of these structures as versatile functional components in photonic devices.

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