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Phys Rev Lett. 2012 Jul 20;109(3):033604. Epub 2012 Jul 19.

Coupling of nitrogen-vacancy centers to photonic crystal cavities in monocrystalline diamond.

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Hewlett Packard Laboratories, 1501 Page Mill Road, Palo Alto, California 94304, USA.


The zero-phonon transition rate of a nitrogen-vacancy center is enhanced by a factor of ∼70 by coupling to a photonic crystal resonator fabricated in monocrystalline diamond using standard semiconductor fabrication techniques. Photon correlation measurements on the spectrally filtered zero-phonon line show antibunching, a signature that the collected photoluminescence is emitted primarily by a single nitrogen-vacancy center. The linewidth of the coupled nitrogen-vacancy center and the spectral diffusion are characterized using high-resolution photoluminescence and photoluminescence excitation spectroscopy.

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