Direct optical interfacing of CVD diamond for deported NV-based sensing experiments

TL;DR

This paper presents a compact device that directly couples a photonic crystal fiber to CVD diamond, enabling efficient NV center excitation, luminescence detection, and ESR experiments for magnetic sensing applications.

Contribution

It introduces a novel direct optical interface between fiber and diamond for improved NV-based sensing experiments.

Findings

Efficient excitation and detection of NV luminescence.

Successful ESR measurements with resolved hyperfine structure.

Potential for compact magnetic field imaging devices.

Abstract

Nitrogen-vacancy (NV) defect in diamond is a very promising tool for numerous sensing applications like magnetometry or thermometry. In this paper, we demonstrate a compact and convenient device for magnetic field imaging where a commercial single mode photonic crystal fibre is directly coupled to a commercial CVD ppm diamond. We managed to excite and detect efficiently the luminescence from an ensemble of NV centres and also to perform Electron Spin Resonance (ESR) experiments where the NV hyperfine structure is perfectly resolved under continuous excitation and measurement.