A Fiber-coupled Scanning Magnetometer with Nitrogen-Vacancy Spins in a Diamond Nanobeam

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.

References in corpus (5)

• Real-space imaging of non-collinear antiferromagnetic order with a single spin magnetometer
• Spin dynamics in the optical cycle of single nitrogen-vacancy centres in diamond
• High-Q optical nanocavities in bulk single-crystal diamond
• Micrometer-scale Magnetic Imaging of Geological Samples Using a Quantum Diamond Microscope
• Directional excitation of a high-density magnon gas using coherently driven spin waves

Cited by in corpus (4)

• Colloquium: Quantum Properties and Functionalities of Magnetic Skyrmions
• Miniaturized magnetic-field sensor based on nitrogen-vacancy centers
• A robust, fiber-coupled scanning probe magnetometer using electron spins at the tip of a diamond nanobeam
• Millimeter-scale rigid diamond probe for high sensitivity endoscopic-magnetometry applications