Dependence of high density nitrogen-vacancy center ensemble coherence on electron irradiation doses and annealing time
At a Glance
Section titled âAt a Glanceâ| 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 | Ministry of Industry and Information Technology, Institute of Semiconductors |
| Citations | 39 |
Abstract
Section titled âAbstractâNegatively charged nitrogen-vacancy (NVâ) 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 NVâ center ensemble on a large scale with a long coherence lifetime. In this work, the NVâ center ensemble is prepared in type-Ib diamond using high energy electron irradiation and annealing, and the transverse relaxation time of the ensembleâT2âwas 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 NVâ centers along three directions to improve fluorescence signal contrast. Finally, NVâ center ensembles with a high concentration of roughly 1015 mmâ3 were manipulated within a ~10 ”s 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 NVâ 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.