# Bandwidth analysis of AC magnetic field sensing based on electronic spin double resonance of nitrogen-vacancy centers in diamond

## TL;DR

This paper analyzes the bandwidth and sensitivity of AC magnetic field sensing using nitrogen-vacancy centers in diamond, focusing on electronic spin double resonance excited by microwaves and RF fields, achieving a bandwidth of about 5 MHz.

## Contribution

It provides a detailed measurement and analysis of double resonance spectra and magnetic field sensitivity across various microwave and RF frequencies.

## Key findings

- Observed a clear anticrossing of RF-dressed electronic spin states.
- Estimated the bandwidth to be approximately 5 MHz at 9.9 MHz center frequency.
- Demonstrated the effectiveness of continuous-wave optically detected magnetic resonance for AC magnetic field sensing.

## Abstract

Recently we have demonstrated AC magnetic field sensing scheme using a simple continuous-wave optically detected magnetic resonance of nitrogen-vacancy centers in diamond [Appl. Phys. Lett. 113, 082405 (2018)]. This scheme is based on electronic spin double resonance excited by continuous microwaves and radio-frequency (RF) fields. Here we measured and analyzed the double resonance spectra and magnetic field sensitivity for various frequencies of microwaves and RF fields. As a result, we observed a clear anticrossing of RF-dressed electronic spin states in the spectra and estimated the bandwidth to be approximately 5 MHz at the center frequency of 9.9 MHz.