Enhancement of fluorescence from nitrogen-vacancy center ensemble in bulk diamond with broadband antireflection coatings
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2020-08-01 |
| Journal | AIP Advances |
| Authors | Lixia Xu, Jixing Zhang, Guodong Bian, Pengcheng Fan, Mingxin Li |
| Institutions | Zhejiang Lab, Beihang University |
| Citations | 5 |
Abstract
Section titled āAbstractāThe negatively charged nitrogen-vacancy (NVā) center in diamond is a promising platform for quantum sensing. However, fluorescence from the NVā centers suffers large energy loss at the diamond-air interface. Here, we propose a broadband antireflection coating to enhance the fluorescence intensity by simultaneously reducing the energy loss of the excitation laser and the fluorescence. The reflectance for normal-incidence light decreases from nearly 17% for bared diamond to below 0.33% for coated diamond in the wavelength range 500 nm-800 nm. The reflectance averaged over the fluorescence bandwidth is below 3% for angles of incidence less than 20Ā°. The measured emitted fluorescence for the coated diamond is 1.44 times that of uncoated diamond, corresponding to nearly 20% improvement in the measurement sensitivity. The proposed method is significant for enhancing the signal-to-noise ratio of NVā-based sensors.