标题： 可见光到近红外范围内氮空位系综的高对比度吸收磁强计 显示英文标题

标题： High-contrast absorption magnetometry in the visible to near-infrared range with nitrogen-vacancy ensembles

摘要： 通过氮空位（NV）中心的磁强计测量迄今为止是通过NV中心的发光或通过1042 nm单重态吸收来实现的。 在这里，我们展示了一种宽带光学吸收现象，NV中心从发射波长开始吸收，并达到1000 nm。 这些测量是通过一个高精细度腔体实现的，该腔体用于室温连续波泵浦-探测实验。 红光到红外探测光束显示了NV自旋典型的光学检测磁共振（ODMR）信号，对比度高达42%。 这种宽带光学吸收在NV磁强计方面尚未有报道。 我们认为，吸收跃迁的低能级可能是能量较低的NV单重态，这是基于共振微波场下光学吸收的增加和光谱行为。 对光子散粒噪声限制灵敏度的调查表明，随着探测波长的增加灵敏度有所提高，达到7.5 pT/$\sqrt{\mathrm{Hz}}$的最佳值。 结果表明，与基于发射的磁强计相比，ODMR对比度显著提高。 这为高灵敏度NV磁强计开辟了一个新的检测波长范围，实现了相干激光信号检测。 显示英文摘要

摘要： Magnetometry with nitrogen-vacancy (NV) centers has so far been measured via emission of light from NV centers or via absorption at the singlet transition at 1042 nm. Here, we demonstrate a phenomenon of broadband optical absorption by the NV centers starting in the emission wavelength and reaching up to 1000 nm. The measurements are enabled by a high-finesse cavity, which is used for room temperature continuous wave pump-probe experiments. The red to infrared probe beam shows the typical optically detected magnetic resonance (ODMR) signal of the NV spin with contrasts up to 42 %. This broadband optical absorption is not yet reported in terms of NV magnetometry. We argue that the lower level of the absorbing transition could be the energetically lower NV singlet state, based on the increased optical absorption for a resonant microwave field and the spectral behavior. Investigations of the photon-shot-noise-limited sensitivity show improvements with increasing probe wavelength, reaching an optimum of 7.5 pT/$\sqrt{\mathrm{Hz}}$. The results show significantly improved ODMR contrast compared to emission-based magnetometry. This opens a new detection wavelength regime with coherent laser signal detection for high-sensitivity NV magnetometry.