Single KTiOPO4 nanocrystals, isolated from a flux‐grown powder, efficiently generate a perfectly stable and blinking‐free second‐harmonic field under non‐resonant femtosecond optical excitation (see image). For each individual nanocrystal, size and three‐dimensional orientation are determined using combined atomic force microscopy and optical techniques.
Individual color centers in diamond are promising for near-term quantum technologies including quantum key distribution and metrology. Here we show fabrication of an as-yet uncharacterized nickel-related complex in diamond which has photophysical properties surpassing the two mainstay centers for single-photon applications, namely, the nitrogen-vacancy and the nickel-nitrogen complex ͑NE8͒ center. This center was fabricated using focused ion-beam implantation of nickel into isolated chemical vapor-deposited diamond crystals. A possible correlation of the center to a Ni/Si complex is substantiated by a coimplantation of Ni and Si into a pure bulk diamond. Room-temperature photoluminescence studies reveal a narrow emission in the near infrared region centered at 768 nm with a lifetime as short as 2 ns.
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