Homogeneous Microwave Delivery for Quantum Sensing with Nitrogen-Vacancy Centers at High Pressures

TL;DR

This paper introduces a novel microwave delivery method for NV centers in diamond anvil cells, enabling more uniform and higher microwave fields at high pressures, improving high-pressure quantum sensing capabilities.

Contribution

A new slotted microwave transmission design for NV centers in diamond anvil cells that enhances field uniformity and strength at high pressures.

Findings

Higher and more uniform microwave fields achieved

Improved performance for wide-field high-pressure measurements

Enhanced ability to probe spatial variations under pressure

Abstract

Nitrogen vacancy (NV) centers have been demonstrated as a useful tool in high pressure environments. However, the geometry and small working area of the diamond anvil cells (DACs) used to apply pressure present a challenge to effective delivery of microwave (mw) fields. We designed and characterized a novel slotted design for mw transmission to nitrogen-vacancy centers (NVs) in a diamond anvil cell via zero-field and in-field optically detected magnetic resonance (ODMR) measurements across pressures between 1 and 48 GPa. The mw fields experienced by NVs across the diamond culet was calculated from Rabi frequency and found to be higher and more uniform than those generated by an equivalent simple mw line, which will improve performance for wide-field, high-pressure measurements to probe spatial variations across samples under pressure.