A Fiber-Coupled Scanning Magnetometer with Nitrogen-Vacancy Spins in a Diamond Nanobeam
Yufan Li (TU Delft - QN/vanderSarlab, Kavli institute of nanoscience Delft)
Fabian A. Gerritsma (Kavli institute of nanoscience Delft, TU Delft - QN/vanderSarlab)
Samer Kurdi (Kavli institute of nanoscience Delft, TU Delft - QN/vanderSarlab)
Nina Codreanu (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab)
Simon Gro¨blacher (Kavli institute of nanoscience Delft, TU Delft - QN/Groeblacher Lab)
Ronald Hanson (TU Delft - QuTech Advanced Research Centre, TU Delft - QID/Hanson Lab, TU Delft - QN/Hanson Lab, Kavli institute of nanoscience Delft)
Richard Norte (TU Delft - Dynamics of Micro and Nano Systems, TU Delft - QN/Groeblacher Lab, Kavli institute of nanoscience Delft)
Toeno van der Sar (TU Delft - QN/vanderSarlab, Kavli institute of nanoscience Delft)
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Abstract
Magnetic imaging with nitrogen-vacancy (NV) spins in diamond is becoming an established tool for studying nanoscale physics in condensed matter systems. However, the optical access required for NV spin readout remains an important hurdle for operation in challenging environments such as millikelvin cryostats or biological systems. Here, we demonstrate a scanning-NV sensor consisting of a diamond nanobeam that is optically coupled to a tapered optical fiber. This nanobeam sensor combines a natural scanning-probe geometry with high-efficiency through-fiber optical excitation and readout of the NV spins. We demonstrate through-fiber optically interrogated electron spin resonance and proof-of-principle magnetometry operation by imaging spin waves in an yttrium-iron-garnet thin film. Our scanning-nanobeam sensor can be combined with nanophotonic structuring to control the light-matter interaction strength and has potential for applications that benefit from all-fiber sensor access, such as millikelvin systems.
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