基于optical fiber的金刚石中氮空位中心系综的温度依赖性
Temperature dependence of nitrogen-vacancy center ensembles in diamond based on an optical fiber
摘要：
金刚石传感中的氮空位（NV）中心由于其高稳定性、良好的温度分辨率和集成度而被认为是一种很有前途的微纳米尺度温度计。在这项工作中，我们制作的传感核心附加一个钻石板含有NV中心的一段切断多模光纤。在此基础上，我们利用连续波光探测磁共振（CW-ODMR）技术测量了NV中心系综的零场分裂参数（D）。参考温度测量采用自制的测温系统和两个经过校准的铂电阻温度计。研究了脉冲序列中的准备时间和计数时间、激光功率、微波功率和微波频率阶跃对制备的影响。得到了298.15 ~ 383.15 K范围内的D和T的实验值，其标准不确定度为u（D）=（3.62268~8.54464）x10^-5 GHz，u（T）=（0.013~ 0.311）K。实验结果与Toyli等人的工作（Toyli等人，2012）使用类似的钻石样品。0 K和700 K下的D-T外推值与文献值一致，同时dD/dT随温度变化。最后，通过比较不同研究小组所测得的D-T关系可知，不同的NV浓度导致不同的电子密度，不同的制造工艺导致不同的热膨胀，会导致不同的D-T关系。这是值得继续进一步的综合研究，特别是从微观角度来看，发展NV中心作为一个实用和准确的微纳米尺度测温。
英文摘要：
The nitrogen-vacancy (NV) centers in diamond sensing has been considered to be a promising micro-nano scale thermometer due to its high stability, good temperature resolution and integration. In this work, we fabricated the sensing core by attaching a diamond plate containing NV centers to the section of a cut-off multi-mode fiber. Then we measured the zero-field splitting parameter (D) of NV center ensembles using continuous-wave optical detected magnetic resonance (CW-ODMR) technique. A home-made thermostatic system and two calibrated platinum resistance thermometers were applied for reference temperature measurement. The effects from preparation time and count time in the pulse sequence, laser power, microwave power, and microwave frequency step were investigated. Moreover, the experimental D and T from 298.15 K to 383.15 K was obtained with the standard uncertainty of u(D) = (3.62268~8.54464)x10^-5 GHz and u(T) = (0.013~ 0.311) K. The experimental results are well consistent with the work of Toyli, et al. (Toyli, et al., 2012) using the similar diamond sample. The extrapolation for D-T at 0 K and 700 K also agree with other references, and meanwhile dD/dT varies with temperature. Finally, comparing the D-T relationship measured by different research groups, we can know that the NV concentration resulting in different electron density and manufacturing procedure resulting in different thermal expansion would lead to different D-T relationship. It is worthy to continue further comprehensive research especially from the metrological point of view to develop NV center as a practical and accurate micro-nano scale thermometry.
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