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Channelling single-photon emission in multiple well-defined directions andsimultaneously controlling its polarization characteristics is highly desirablefor numerous quantum technology applications. We show that this can be achievedby using quantum emitters (QEs) nonradiatively coupled to surface plasmonpolaritons (SPPs), which are scattered into outgoing free-propagating waves byappropriately designed metasurfaces. The QE-coupled metasurface design is basedon the scattering holography approach with radially diverging SPPs as referencewaves. Using holographic metasurfaces fabricated around nanodiamonds withsingle Ge vacancy centers, we experimentally demonstrate on-chip integratedefficient generation of two well-collimated single-photon beams propagatingalong different 15-degree off-normal directions with orthogonal linearpolarizations.

Scattering holography designed metasurfaces for channeling single-photon emission