Tellurite glass rods with nanodiamonds as photonic magnetic field and temperature sensors

TL;DR

This paper demonstrates a hybrid tellurite glass rod doped with nanodiamonds containing nitrogen-vacancy centers, capable of magnetic field and temperature sensing with high sensitivity, suitable for fiber-based photonic sensors.

Contribution

It introduces a novel hybrid glass rod sensor combining nanodiamond fluorescence with tellurite glass, enabling fiber-compatible magnetic and thermal sensing.

Findings

Magnetic field sensitivity of 10$^{-5}$ T Hz$^{-1/2}$

Temperature sensitivity of 74 kHz K$^{-1}$

Effective sensing within 8 Kelvin range at room temperature

Abstract

We present the results of work on a hybrid material composed of a tellurite glass rod doped with nanodiamonds containing nitrogen-vacancy-nitrogen and paramagnetic nitrogen-vacancy color centers. The reported results include details on tellurite glass and cane fabrication, confocal and wide-field imaging of the nanodiamond distribution in their volume, as well as on the spectroscopic characterization of their fluorescence and Optically Detected Magnetic Resonance measurements of magnetic fields and temperatures. Magnetic fields up to 50 G were examined with a sensitivity of 10$^{-5}$ T Hz$^{-1/2}$ whereas temperature measurements were simultaneously performed with a sensitivity of 74 kHz K$^{-1}$ within the 8 Kelvin range at room temperature. In that way, we demonstrate the suitability of such systems for fiber magneto- and thermometry with a reasonable performance already in the form of glass rods. At the same time, the rods constitute an interesting starting point for further processing into photonic components such as microstructured fibers or fiber tapers for the realization of specialized sensing modalities.