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Plasmonic Apertures: A Scalable Plasmonic Architecture for Enhanced Diamond Single Photon Sources

İrfan Bulu, Birgit Hausmann, Jennifer T. Choy, Thomas M. Babinec, Marko Lončar

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We propose and demonstrate that plasmonic apertures provide a scalable architecture for diamond NV center applications. Our results show that emission rates can be enhanced up to 60 times with collection efficiencies up to %40.
DOI
10.1364/qels.2011.qfg3

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We propose a novel source of non-classical light consisting of plasmonic aperture with single-crystal diamond containing a single Nitrogen-Vacancy (NV) color center. Theoretical calculations of optimal structures show that these devices can simultaneously enhance optical pumping by a factor of 7, spontaneous emission rates by Fp~50 (Purcell factor), and offer collection efficiencies up to 40%. These excitation and collection enhancements occur over a broad range of wavelengths (~30 nm), and are independently tunable with device geometry, across the excitation (~530 nm) and emission (~600-800 nm) spectrum of the NV center. Implementing this system with top-down techniques in bulk diamond crystals will provide a scalable architecture for a myriad of diamond NV center applications.
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.
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