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On the characterization of color-centre single photon emitters in diamond

D. Gatto Monticone, Ekaterina V. Moreva, P. Traina, P. Olivero, Luca Boarino, Giampiero Amato, Ivo Pietro Degiovanni, G. Brida, Marco Genovese

Published Jan 1, 2013• 0 citations
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Diamond is emerging as an optical supermaterial, due to its wide transparency bandwidth, excellent thermooptic properties and most notably its stable, large dipole moment, room temperature, single photon emitting colour centres. In this paper we present recent progress in the characterization of non radiative and radiative decay in single impurities and the fabrication of hybrid diamond-tellurite optical structures.. First, we present direct imaging of the emission pattern of individual ion implanted chromium-based single photon emitters in diamond and measure their quantum efficiency. By comparing the decay rates from the single chromium emitters at different depths in the diamond crystal, we measured an average quantum efficiency of 28%. Second, a hybrid approach involving a soft glass tellurite host material has been introduced, allowing nitrogen-vacancy (NV-) diamond emitters to be built into an optical fibre. The potential of integrating Cr-related centres in hybrid optical structures is also discussed.
Single-photon sources represent a key enabling technology in quantum optics, and single color centers in diamond are a promising platform to serve this purpose, due to their high quantum efficiency and photostability at room temperature. The widely studied nitrogen-vacancy (NV) centers are characterized by several limitations, thus other defects have recently been considered, with a specific focus of centers emitting in the near-infra red (NIR). In the present work, we report on the coupling of native NIR-emitting centers in high-quality single-crystal diamond with solid immersion lens (SIL) structures fabricated by focused ion beam (FIB) lithography. The reported improvements in terms of light collection efficiency make the proposed system an ideal platform for the development of single-photon emitters with appealing photophysical and spectral properties.