Broadband, large-area microwave antenna for optically-detected magnetic resonance of nitrogen-vacancy centers in diamond

TL;DR

This paper introduces a broadband, large-area microwave antenna designed for optically-detected magnetic resonance of NV centers in diamond, enabling improved quantum sensing and imaging at room temperature.

Contribution

The authors developed a microwave planar ring antenna with a broad bandwidth and uniform field, optimized for ODMR of NV centers over a large area without frequency adjustment.

Findings

Resonance frequency at 2.87 GHz with 400 MHz bandwidth

Uniform magnetic field within 1-mm diameter area

Supports magnetic-field imaging up to 100 G

Abstract

We report on a microwave planar ring antenna specifically designed for optically-detected magnetic resonance (ODMR) of nitrogen-vacancy (NV) centers in diamond. It has the resonance frequency at around 2.87 GHz with the bandwidth of 400 MHz, ensuring that ODMR can be observed under external magnetic fields up to 100 G without the need of adjustment of the resonance frequency. It is also spatially uniform within the 1-mm-diameter center hole, enabling the magnetic-field imaging in the wide spatial range. These features facilitate the experiments on quantum sensing and imaging using NV centers at room temperature.