Efficient nitrogen-vacancy centers' fluorescence excitation and collection from micrometer-sized diamond by a tapered optical fiber

Abstract

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.

arXiv comment11 pages, 13 figures

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Cited by in corpus (9)

• Sub-nanotesla magnetometry with a fibre-coupled diamond sensor
• Fluorescent diamond microparticles doped glass fiber for magnetic field sensing
• Experimental and theoretical analysis of noise strength and environmental correlation time for ensembles of nitrogen-vacancy centers in diamond
• Tapered ultra-high Numerical Aperture optical fiber tip for Nitrogen Vacancy ensembles based endoscope in a fluidic environment
• Heterogeneous integration of solid state quantum systems with a foundry photonics platform
• Diamond Nitrogen-Vacancy Center Magnetometry: Advances and Challenges
• Diamond-optic enhanced photon collection efficiency for sensing with nitrogen-vacancy centers
• A Fully-integrated Diamond Nitrogen-Vacancy Magnetometer with Nanotesla Sensitivity
• NV microscopy of thermally controlled stresses caused by Cr${}_2$O${}_3$ thin films