High-efficiency fluorescence collection for NV- center ensembles in diamond
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-04-03 |
| Journal | Optics Express |
| Authors | Lixia Xu, Heng Yuan, Ning Zhang, Jixing Zhang, Guodong Bian |
| Institutions | Beihang University |
| Citations | 40 |
Abstract
Section titled āAbstractāThe negatively charged nitrogen vacancy (NV<sup>-</sup>) center ensembles in diamond have been demonstrated to be a promising platform for quantum metrology, but the poor fluorescence collection efficiency of a microscope objective limits the sensitivity of the NV<sup>-</sup> based sensors. Here we present a method for increasing the collected fluorescence intensity with a total internal reflection (TIR) lens. The detected fluorescence intensity is increased by approximately a factor of 56 compared with detection using a microscope objective with NA = 0.55, leading to a collection efficiency of 47.7% Ā± 3.1%. The signal-to-noise ratio is improved by a factor of 7.6 using the TIR lens. The proposed method is of great significance for collecting fluorescence from NV<sup>-</sup> centers in a large volume and can be used in weak fluorescence detection systems.