Broadband magnetometry and temperature sensing with a light-trapping diamond waveguide
Broadband magnetometry and temperature sensing with a light-trapping diamond waveguide
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DOI：
10.1038/nphys3291
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发表时间：
2015-05-01
期刊：
影响因子：
19.6
通讯作者：
Englund, Dirk
中科院分区：
文献类型：
--
作者：
Clevenson, Hannah;Trusheim, Matthew E.;Englund, Dirk
固态量子传感器因其在室温下的灵敏度而引起了广泛的关注。特别是，金刚石（1-3）中单个氮空位（NV）色心的自旋特性使其成为环境条件下磁场（4-9）、电场（10）和温度（11-13）的杰出纳米传感器。最近在基于NV集成的磁力计（14-16）、惯性传感器（17）和时钟（18）上的工作采用了无纠缠色心来实现灵敏度的显著提高（15,19）。然而，为了在实践中实现这种潜在的灵敏度增强，需要新的技术来有效地激发和收集来自大型NV集合的光信号。在这里，我们介绍了一种具有激发效率和信号收集的光捕获金刚石波导几何结构，使泵浦光子转化为光学检测磁共振（20）（ODMR）荧光的转换效率超过5%，比以前的单通道几何结构提高了三个数量级以上。这种显著增强的ODMR信号使低频范围内的磁场和温度的精确宽带测量成为可能，否则动态解耦技术无法实现。NV的低吸收截面（21）到目前为止
Solid-state quantum sensors are attracting wide interest because of their sensitivity at room temperature. In particular, the spin properties of individual nitrogen-vacancy (NV) colour centres in diamond(1-3) make them outstanding nanoscale sensors of magnetic fields(4-9), electric fields(10) and temperature(11-13) under ambient conditions. Recent work on NV ensemble-based magnetometers(14-16), inertial sensors(17), and clocks(18) has employed unentangled colour centres to realize significant improvements in sensitivity(15,19). However, to achieve this potential sensitivity enhancement in practice, new techniques are required to excite efficiently and to collect the optical signal from large NV ensembles. Here, we introduce a light-trapping diamond waveguide geometry with an excitation efficiency and signal collection that enables in excess of 5% conversion efficiency of pump photons into optically detected magnetic resonance(20) (ODMR) fluorescence-animprovement over previous single-pass geometries of more than three orders of magnitude. This marked enhancement of the ODMR signal enables precision broadband measurements of magnetic field and temperature in the low-frequency range, otherwise inaccessible by dynamical decoupling techniques. The NV's low absorption cross-section(21) has thus far