Optically detected magnetic resonance of nitrogen-vacancy centers in microdiamonds inside nanopolycrystalline diamond anvil cell

TL;DR

This paper demonstrates the use of optically detected magnetic resonance (ODMR) of nitrogen-vacancy centers in microdiamonds within a nanopolycrystalline diamond anvil cell to measure high pressures exceeding 30 GPa, enabling advanced sensing under extreme conditions.

Contribution

It introduces a novel method combining NPD anvils and microdiamonds with NV centers for high-pressure magnetic sensing using ODMR.

Findings

Successful ODMR detection at pressures over 30 GPa

Resonance frequency varies with pressure distribution

NPD anvils are suitable for optical measurements under extreme conditions

Abstract

We demonstrated optically detected magnetic resonance (ODMR) of nitrogen-vacancy (NV) centers in microdiamonds inside a diamond anvil cell pressurized with nanopolycrystalline diamond (NPD) anvils. NPD exhibits high optical transparency, superior hardness, and low thermal conductivity, making it suitable for optical and spectroscopic measurements under high-pressure and high-temperature conditions. We observed the ODMR signal from an ensemble of NV centers under conditions where NV centers in microdiamonds served as markers for pressures exceeding 30 GPa, with a culet diameter of 600 $\mu$m. We also performed ODMR measurements on multiple microdiamonds sealed inside a sample chamber and found that the resonance frequency varied with the pressure distribution. The combination of NPD and microdiamonds containing NV centers is auspicious for pressure and magnetic sensing under concurrent high-pressure and high-temperature conditions.