Fiber-integrated silicon carbide silicon vacancy-based magnetometer

TL;DR

This paper presents a compact, fiber-integrated silicon vacancy-based magnetometer in silicon carbide capable of room-temperature magnetic field sensing, suitable for practical applications like geophysics and biomedical sensing.

Contribution

The work introduces a fiber-integrated silicon vacancy magnetometer in silicon carbide, enabling practical, room-temperature quantum sensing with effective fiber coupling and magnetic field measurement capabilities.

Findings

Achieved a magnetic field sensitivity of 12.3 μT/Hz^{1/2}.

Successfully coupled silicon vacancy in silicon carbide to an optical fiber for readout.

Demonstrated measurement of magnetic field strength and polar angle.

Abstract

Silicon vacancy in silicon carbide has drawn much attention for various quantum sensing. However, most of the previous experiments are achieved using confocal scanning systems, which limit its applications in practical applications. In this work, we demonstrate a compact fiber-integrated silicon carbide silicon vacancy-based vector magnetometer at room temperature. First, we effectively couple the silicon vacancy in a tiny silicon carbide slice to an optical fiber tip and realize the readout of the spin signal through the fiber at the same time. We then study the optically detected magnetic resonance spectra at different laser and microwave powers, obtaining an optimized magnetic field sensitivity of 12.3 {\mu}T/Hz1/2. Based on this, the magnetometer is performed to measure the strength and polar angle of an external magnetic field, respectively. Through these experiments, we have paved the way for fiber-integrated silicon vacancy-based magnetometer applications in practical environments such as geophysics and biomedical sensing.