Guo Hao, Chen Yulei, Wu Dajin, Zhao Rui, Tang Jun, Ma Zongmin, Xue Chenyang, Zhang Wendong, Liu Jun
Opt Lett. 2017 Feb 1;42(3):403-406. doi: 10.1364/OL.42.000403.
A method for enhancement of the sensitivity of a spin sensor based on an ensemble of nitrogen vacancy (NV) color centers was demonstrated. Gold nanoparticles (NPs) were deposited on the bulk diamond, which had NV centers distributed on its surface. The experimental results demonstrate that, when using this simple method, plasmon enhancement of the deposited gold NPs produces an improvement of ∼10 times in the quantum efficiency and has also improved the signal-to-noise ratio by approximately ∼2.5 times. It was also shown that more electrons participated in the spin sensing process, leading to an improvement in the sensitivity of approximately seven times; this has been proved by Rabi oscillation and optical detection of magnetic resonance (ODMR) measurements. The proposed method has proved to be a more efficient way to design an ensemble of NV centers-based sensors; because the result increases in the number of NV centers, the quantum efficiency and the contrast ratio could greatly increase the device's sensitivity.
展示了一种提高基于氮空位（NV）色心集合的自旋传感器灵敏度的方法。金纳米颗粒（NPs）沉积在块状金刚石上，其表面分布有NV中心。实验结果表明，使用这种简单方法时，沉积的金纳米颗粒的等离子体增强使量子效率提高了约10倍，并且还使信噪比提高了约2.5倍。还表明有更多电子参与自旋传感过程，导致灵敏度提高了约7倍；这已通过拉比振荡和磁共振光学检测（ODMR）测量得到证明。所提出的方法已被证明是设计基于NV中心集合的传感器的一种更有效方法；由于NV中心数量增加的结果，量子效率和对比度可大大提高器件的灵敏度。
