基于高效荧光收集的氮-空位色心磁强计灵敏度提升技术研究

Research on sensitivity enhancement techniques for nitrogen-vacancy center magnetometers based on efficient fluorescence collection

近年来,集成化金刚石氮空位色心磁强计引起了广泛的学术关注。然而,高灵敏度集成磁强计的发展受到了荧光收集效率低下的阻碍。为解决此问题,创新性地引入了金刚石表面磁控溅射反射涂层和侧壁切角技术,有效将荧光收集效率从34.2%提升至67.9%。经过处理的金刚石被集成在了2.9×2.1×2 cm^(3)体积之内的磁强计探头中。测试结果显示,在同样的磁强计体积内,切角和涂层技术的应用使得磁强计灵敏度从21.3 nT/Hz^(1/2)提升到5.7 nT/Hz^(1/2)。因此,通过切角和涂层增强了荧光强度的收集,提升了集成化金刚石NV色心磁强计的灵敏度。

In recent years,the integration of diamond nitrogen-vacancy(NV)center magnetometers has garnered widespread academic attention.However,the development of highly sensitive integrated magnetometers has been hindered by the low fluorescence collection efficiency.To address this issue,innovative approaches involving the introduction of diamond surface magnetron sputtering reflective coatings and sidewall angle-cutting techniques have been employed,effectively enhancing the fluorescence collection efficiency from 34.2%to 67.9%.The processed diamond was integrated into a magnetometer probe within a volume of 2.9×2.1×2 cm^(3).Test results demonstrate that within the same volume of the magnetometer,the application of angle cutting and coating techniques has elevated the sensitivity of the magnetometer from 21.3 nT/Hz^(1/2) to 5.7 nT/Hz^(1/2).Thus,through the enhancement of fluorescence intensity collection via angle cutting and coating,the sensitivity of integrated diamond NV center magnetometers has been improved.