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OSA Advanced Photonics Congress

Plasmonic Nanoantenna for Single-Photon Sources on Diamond: Pursuing 100% Collection Efficiency

Ilia M. Fradkin, Mario Agio, Dmitry Yu. Fedyanin

Published Jan 1, 2018• 0 citations
Publisher

Abstract

We demonstrate a nanoantenna for single-photon photon sources on diamond, which does not only enhance the quantum efficiency via the Purcell effect, but also gives the possibility to collect more than 85% of emitted photons.
DOI
10.1364/noma.2018.noth4d.5

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Solid-state quantum emitters such as the N-VVV center in diamond have applications ranging from single-photon sources to quantum sensors, with some quantum properties preserved even under ambient conditions. A central challenge is to access these quantum properties efficiently, by catching as much emitted light as possible. In this study a tunable optical microcavity, with a mode volume as small as one wavelength cubed, is used to enhance spontaneous emission of single N-VVV centers in diamond, via the Purcell effect. This allows the authors to extract large amounts of light from several individually addressable emitters, and to control their spontaneous-emission rate.
We demonstrate an approach, based on plasmonic apertures and gratings, to enhance the radiative decay rate of single nitrogen-vacancy (NV) centers in diamond while simultaneously improving their collection efficiency. Our structures are based on metallic resonators formed by surrounding sub-wavelength diamond nanoposts with a silver film, which can enhance the spontaneous emission rate of an embedded NV center. However, the collection efficiency of emitted photons remains low due to losses to surface plasmons and reflections at the diamond-air interface. In this work, we mitigate photon losses into these channels by incorporating grating structures into the plasmonic cavity system.