Metal-Dielectric Parabolic Antenna for Directing Single Photons

Sergii Morozov, Michele Gaio, Stefan A. Maier, Riccardo Sapienza

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22 Citations (Scopus)


Quantum emitters radiate light omni-directionally, making it hard to collect and use the generated photons. Here, we propose a three-dimensional metal-dielectric parabolic antenna surrounding an individual quantum dot as a source of collimated single photons, which can then be easily extracted and manipulated. Our fabrication method relies on a single optically induced polymerization step once the selected emitter has been localized by confocal microscopy. Compared to conventional nanoantennas, our geometry does not require near-field coupling, and it is, therefore, very robust against misalignment issues and minimally affected by absorption in the metal. The parabolic antenna provides one of the largest reported experimental directivities (D = 106) and the lowest beam divergences (Θ1/2 = 13.5°) and a broadband operation over all of the visible and near-infrared range together with extraction efficiency of more than 96%, offering a practical advantage for quantum technological applications.

Original languageEnglish
Pages (from-to)3060-3065
Number of pages6
JournalNano Letters
Issue number5
Publication statusPublished - 9 May 2018
Externally publishedYes


  • direct laser writing
  • directional emission
  • directivity
  • nanophotonics
  • Optical antenna
  • quantum dot
  • single photon emitter

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