Towards a multi-channel zero-field optically pumped magnetometer for imaging

IF 5.6 2区物理与天体物理 Q1 OPTICS

EPJ Quantum Technology Pub Date : 2025-08-13 DOI:10.1140/epjqt/s40507-025-00400-y

Ronja Rasser, Peter A. Koss, Svenja Knappe, Karsten Buse

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Abstract

We present a design for a multi-channel optically pumped zero-field magnetometer utilizing a 200-μm-thick Rubidium vapor cell. The vapor cell and its housing are designed to reduce the minimal distance between a magnetic sample and the sensing volume to about 1 mm, to optimize the effective spatial resolution. The thin vapor cell, filled with 2 atm of nitrogen as a buffer gas reduces the volume across which the magnetic field is averaged. The vapor cell is fully illuminated by a single laser beam, and the transmitted light is imaged onto a 4 x 4 photodiode array, allowing for simultaneous measurement of a magnetic field distribution with up to 16 channels. The performance of the magnetometer is studied for all channels. It is shown that the sensor can operate in the spin-exchange relaxation-free regime with a projected photon-shot noise limited noise floor of about 1 pT/Hz^1/2 for a sensitive voxel size of approximately 600 μm x 600 μm x 200 μm.

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用于成像的多通道零场光泵磁力仪

我们设计了一种利用200 μm厚铷蒸气电池的多通道光泵零场磁强计。蒸汽电池及其外壳的设计旨在将磁性样品与传感体之间的最小距离减小到约1mm，以优化有效空间分辨率。薄的蒸汽电池，充满了2atm的氮气作为缓冲气体，减少了磁场平均的体积。蒸汽电池由单个激光束完全照亮，透射光成像到4 x 4光电二极管阵列上，允许同时测量多达16个通道的磁场分布。研究了磁强计在所有通道下的性能。结果表明，当敏感体素尺寸约为600 μm x 600 μm x 200 μm时，该传感器可以在无自旋交换弛豫状态下工作，其投影光子散射噪声限制本底噪声约为1 pT/Hz1/2。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

EPJ Quantum Technology Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

7.70

自引率

7.50%

发文量

审稿时长

71 days

期刊介绍： Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics. EPJ Quantum Technology covers theoretical and experimental advances in subjects including but not limited to the following: Quantum measurement, metrology and lithography Quantum complex systems, networks and cellular automata Quantum electromechanical systems Quantum optomechanical systems Quantum machines, engineering and nanorobotics Quantum control theory Quantum information, communication and computation Quantum thermodynamics Quantum metamaterials The effect of Casimir forces on micro- and nano-electromechanical systems Quantum biology Quantum sensing Hybrid quantum systems Quantum simulations.