锥形optical fiber对微米级金刚石氮空位中心荧光的有效激发和收集
Efficient nitrogen-vacancy centers' fluorescence excitation and collection from micrometer-sized diamond by a tapered optical fiber
摘要：
有效地激发金刚石中的氮空位（NV）中心并收集它们的荧光显着有利于基于光纤的NV传感器。在这里，使用锥形光纤（TOF）尖端，我们显着提高了激光激发和荧光收集的NV的效率，从而提高了基于光纤的微米级金刚石磁传感器的灵敏度。数值计算表明，该TOF针尖具有较高的数值孔径（NA），并具有较高的荧光激发和收集效率。实验证明，使用这种TOF尖端可以获得高达平端（非TOF）光纤的超过7倍的荧光激发效率和超过15倍的荧光收集效率。这种荧光采集方式提高了光纤金刚石NV磁强计的灵敏度，从而扩大了其潜在的应用领域。
英文摘要：
Efficiently excite nitrogen-vacancy (NV) centers in diamond and collect their fluorescence significantly benefit the fiber-optic-based NV sensors. Here, using a tapered optical fiber (TOF) tip, we significantly improve the efficiency of the laser excitation and fluorescence collection of the NV, thus enhance the sensitivity of the fiber-optic based micron-sized diamond magnetic sensor. Numerical calculation shows that the TOF tip delivers a high numerical aperture (NA) and has a high fluorescence excitation and collection efficiency. Experiments demonstrate that using such TOF tip can obtain up to over 7-fold the fluorescence excitation efficiency and over15-fold the fluorescence collection efficiency of a flat-ended (non-TOF) fiber. Such fluorescence collection enhances the sensitivity of the optical fiber-based diamond NV magnetometer, thus extending its potential application region.
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