Non-Invasive Imaging Method of Microwave Near Field Based on Solid State Quantum Sensing

TL;DR

This paper introduces a non-invasive microwave near field imaging technique using diamond nitrogen-vacancy centers, enabling high-resolution, full vector field reconstruction for circuit and antenna analysis.

Contribution

It presents a novel imaging method combining pulsed sequences and CCD detection for vector field measurement, surpassing raster scanning limitations.

Findings

High-resolution near field imaging achieved

Full vector field reconstruction demonstrated

Potential applications in circuit diagnosis and antenna characterization

Abstract

In this paper, we propose a non-invasive imaging method of microwave near field using a diamond containing nitrogen-vacancy centers. We applied synchronous pulsed sequence combined with charge coupled device camera to measure the amplitude of the microwave magnetic field. A full reconstruction formulation of the local field vector, including the amplitude and phase, is developed by measuring both left and right circular polarizations along the four nitrogen-vacancy axes. Compared to the raster scanning approach, the two dimensional imaging method is promising for application to circuit failure analysis. A diamond film with micrometer thinness enables high-resolution near field imaging. The proposed method is expected to have applications in monolithic-microwave-integrated circuit chip local diagnosis, antenna characterization, and field mode imaging of microwave cavities and waveguides.