Dependence of high density nitrogen-vacancy center ensemble coherence on electron irradiation doses and annealing time
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-11-02 |
| Journal | Journal of Physics D Applied Physics |
| Authors | Chen Zhang, Heng Yuan, N Zhang, Lixia Xu, Bo Li |
| Institutions | Beihang University, Institute of Semiconductors |
| Citations | 39 |
Abstract
Section titled āAbstractāNegatively charged nitrogen-vacancy (NVā) center ensembles in diamond have proved to have great potential for use in highly sensitive, small-package solid-state quantum sensors. One way to improve sensitivity is to produce a high-density NVā center ensemble on a large scale with a long coherence lifetime. In this work, the NVā center ensemble is prepared in type-Ib diamond using high energy electron irradiation and annealing, and the transverse relaxation time of the ensembleāT2āwas systematically investigated as a function of the irradiation electron dose and annealing time. Dynamical decoupling sequences were used to characterize T2. To overcome the problem of low signal-to-noise ratio in T2 measurement, a coupled strip lines waveguide was used to synchronously manipulate NVā centers along three directions to improve fluorescence signal contrast. Finally, NVā center ensembles with a high concentration of roughly 1015 mmā3 were manipulated within a ~10 Āµs coherence time. By applying a multi-coupled strip-lines waveguide to improve the effective volume of the diamond, a sub-femtotesla sensitivity for AC field magnetometry can be achieved. The long-coherence high-density large-scale NVā center ensemble in diamond means that types of room-temperature micro-sized solid-state quantum sensors with ultra-high sensitivity can be further developed in the near future.