GPa Pressure Imaging Using Nanodiamond Quantum Sensors

TL;DR

This paper introduces a novel wide-field optical microscopy technique using nanodiamond quantum sensors to map pressure distribution at approximately 20 GPa in diamond anvil cells, enabling detailed pressure and stress analysis.

Contribution

The study demonstrates the use of NV centers in nanodiamonds for pressure imaging in DACs and compares methods of ND incorporation affecting non-hydrostaticity.

Findings

Effective pressure mapping at 20 GPa using NV centers.

Embedding method influences non-hydrostaticity levels.

Technique adaptable to other physical measurements.

Abstract

We demonstrate wide-field optical microscopy of the pressure distribution at approximately 20 GPa in a diamond anvil cell (DAC), using nitrogen-vacancy (NV) centers in nanodiamonds (NDs) as quantum sensors. Pressure and non-hydrostaticity maps are obtained by fitting optically detected magnetic resonance (ODMR) spectra with models incorporating hydrostatic and uniaxial stress conditions. Two methods for introducing NDs with a pressure-transmitting medium are compared, revealing that the embedding approach affects the degree of non-hydrostaticity. This ND-based technique offers a powerful imaging platform for probing pressure-induced phenomena and is extendable to other physical quantities such as magnetic fields.