A fiber based diamond RF B-field sensor and characterization of a small helical antenna

TL;DR

This paper introduces a fiber-based diamond micro-crystal sensor for high-resolution microwave magnetic field imaging, demonstrating detailed B-field mapping of a helical antenna with potential applications in device characterization.

Contribution

It presents a novel fiber-coupled diamond NV center sensor with pulsed quantum techniques for fast, high-resolution magnetic field mapping, advancing near-field microwave measurement methods.

Findings

Achieved sub-100 micron resolution in B-field mapping.

Validated measurements with numerical simulations.

Demonstrated applicability in antenna and microwave circuit diagnostics.

Abstract

We present a microwave B-field scanning imaging technique using diamond micro-crystal containing nitrogen vacancy center that is attached to a fiber tip. We propose a pulsed modulation technique, enabling the implementation of a variety of pulsed quantum algorithm for state manipulation and fast readout of spin state. A detailed mapping of the magnetic B-field distribution of a helical antenna with sub-100 micron resolution is presented and compared with numerical simulations. This fiber based microwave B-field probe has the advantage of minimized invasiveness, small overall size, will boost broad interest in a variety of applications where near field distribution is essential to device characterization, to name a few, antenna radiation profiling, monolithic microwave integrated circuits failure diagnosis, electromagnetic compatibility test of microwave integrated circuits and microwave cavity field mode mapping.