Abstract
We report on a novel method to fabricate single, multiple and large-area high-density ensembles of nitrogen vacancy (NV) color centers in synthetic type Ib bulk diamond by femtosecond laser illumination. Electron beams generated in propagation of intense infrared laser pulses in air sputtered on a diamond sample under high temperature aroused by the laser illumination, creating NV color centers. Typical photoluminescence (PL) spectra of NV centers could be observed on the illuminated spots. Photon streams from individual photoluminescent points exhibited anti-bunching effect by the second-order correlation measurement, evidencing single and multiple photon-emitters around the laser illuminated spots.
Highlights
Various defects in diamond are considered to be prospective single-photon sources (SPSs) due to their remarkable properties [1,2,3,4,5]
We report on a novel method to fabricate single, multiple and large-area high-density ensembles of nitrogen vacancy (NV) color centers in synthetic type Ib bulk diamond by femtosecond laser illumination
Electron beams generated in propagation of intense infrared laser pulses in air sputtered on a diamond sample under high temperature aroused by the laser illumination, creating NV color centers
Summary
Various defects in diamond are considered to be prospective single-photon sources (SPSs) due to their remarkable properties [1,2,3,4,5]. Of all the optically active defects, the negatively charged NV center (NV-) in diamond has been very well studied and used as single-photon emitters in a variety of applications, such as quantum key distribution in free space, experimental demonstration of wave-particle duality of photons [6,7]. The spin coherence of NV centers in diamond could last for several milliseconds and the spin-triplet ground state of a NV center is quite suitable for sensitive magnetic field measurement. Single NV centers were already used for nanometer-scale magnetometry and high-density ensembles of NV centers have been studied in recent years, showing possibilities for applications in magnetometry [10,11,12,13]
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