title: Optical and spin coherence properties of nitrogen-vacancy centers placed in a 100 nm thick isotopically purified diamond layer.
abstract: We have studied optical and spin properties of near-surface nitrogen-vacancy (NV) centers incorporated during chemical vapor phase growth of isotopically purified (12)C single-crystal diamond layers. The spectral diffusion-limited line width of zero-phonon luminescence from the NV centers is 1.2 ± 0.5 GHz, a considerable improvement over that of NV centers formed by ion implantation and annealing. Enhanced spin dephasing times (T(2)* ≈ 90 μs, T(2) ≈ 1.7 ms) due to the reduction of (13)C nuclear spins persist even for NV centers placed within 100 nm of the surface.
authors.affiliation: Graduate School of Fundamental Science and Technology, Keio University, Yokohama 223-8522, Japan.
authors.forename: Toyofumi
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Kai-Mei C
authors.initials: KM
authors.lastname: Fu
authors.forename: Charles
authors.initials: C
authors.lastname: Santori
authors.forename: Victor M
authors.initials: VM
authors.lastname: Acosta
authors.forename: Raymond G
authors.initials: RG
authors.lastname: Beausoleil
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Watanabe
authors.forename: Shinichi
authors.initials: S
authors.lastname: Shikata
authors.forename: Kohei M
authors.initials: KM
authors.lastname: Itoh