We demonstrated a fiber-integrated diamond-based magnetometer in this paper. In the
system, the fluorescence of nitrogen vacancy (NV) centers in nanodiamonds deposited on a
tapered fiber was coupled to the tapered fiber effectively and detected at the output end of
the fiber. By using this scheme, optically detected electron spin resonance spectra were
recorded for single NV centers. The results confirmed that such a tapered fiber-
nanodiamond system can act as a magnetometer. Featured with excellent portability …