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4 June 2010 Single-photon emission from Ni-related color centers in CVD diamond
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Color centers in diamond are very promising candidates among the possible realizations for practical singlephoton sources because of their long-time stable emission at room temperature. The popular nitrogen-vacancy center shows single-photon emission, but within a large, phonon-broadened spectrum (≈ 100 nm), which strongly limits its applicability for quantum communication. By contrast, Ni-related centers exhibit narrow emission lines at room temperature. We present investigations on single color centers consisting of Ni and Si created by ion implantation into single crystalline IIa diamond. We use systematic variations of ion doses between 108 cm-2 and 1014 cm-2 and energies between 30 keV and 1.8MeV. The Ni-related centers show emission in the near infrared spectral range (≈ 770 nm to 787 nm) with a small line-width (≈ 3 nm FWHM). A measurement of the intensity correlation function proves single-photon emission. Saturation measurements yield a rather high saturation count rate of 77.9kcounts/s. Polarization dependent measurements indicate the presence of two orthogonal dipoles.
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David Steinmetz, Elke Neu, Christian Hepp, Roland Albrecht, Wolfgang Bolse, Jan Meijer, Detlef Rogalla, and Christoph Becher "Single-photon emission from Ni-related color centers in CVD diamond", Proc. SPIE 7727, Quantum Optics, 77270P (4 June 2010);

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