Evaluation of optical parameters for a microminiature Rb vapor cell in a dual-beam SERF magnetometer

Wang, Yaxiang; Shi, Tao; Zhou, Weiyong; Tang, Junjian; Zhou, Binquan; Jin, Ge; Han, Bangcheng; Zou, Sheng

doi:10.1364/oe.458827

Cited by 8 publications

(6 citation statements)

References 33 publications

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“…The circular component of the light creates relatively uniform spin polarization, and the linear component is used to measure optical rotation generated by the atoms. The following is the Bloch equation describing the polarization state of atoms in the cell [ 24 , 25 , 26 , 27 , 28 ]:

where

is an atomic polarization state.

is the slowing-down factor.…”

Section: Serf Ammentioning

confidence: 99%

Atomic Magnetometer Achieves Visual Salience Analysis in Drosophila

Liu

et al. 2023

Sensors

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An atomic magnetometer (AM) was used to non-invasively detect the tiny magnetic field generated by the brain of a single Drosophila. Combined with a visual stimulus system, the AM was used to study the relationship between visual salience and oscillatory activity of the Drosophila brain by analyzing changes in the magnetic field. Oscillatory activity of Drosophila in the 1–20 Hz frequency band was measured with a sensitivity of 20 fT/Hz. The field in the 20–30 Hz band under periodic light stimulation was used to explore the correlation between short-term memory and visual salience. Our method opens a new path to a more flexible method for the investigation of brain activity in Drosophila and other small insects.

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where

is an atomic polarization state.

is the slowing-down factor.…”

Section: Serf Ammentioning

confidence: 99%

Atomic Magnetometer Achieves Visual Salience Analysis in Drosophila

Liu

et al. 2023

Sensors

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“…The magnetometer has a sensitivity of 35

and can be used for cardiac magnetic measurements. Some recent applications for SERF magnetometers related to parameter optimization [ 118 ], differential measurement [ 119 , 120 ], and triaxial measurement [ 121 ] are using DFB lasers for the light source, and perhaps VCSELs with low noise and high frequency stability will be used as the light source for further miniaturization and integration.…”

Section: Application Of Vcsel In a Chip-scale Atomic Magnetometermentioning

confidence: 99%

Application of VCSEL in Bio-Sensing Atomic Magnetometers

et al. 2022

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Recent years have seen rapid development of chip-scale atomic devices due to their great potential in the field of biomedical imaging, namely chip-scale atomic magnetometers that enable high resolution magnetocardiography (MCG) and magnetoencephalography (MEG). For atomic devices of this kind, vertical cavity surface emitting lasers (VCSELs) have become the most crucial components as integrated pumping sources, which are attracting growing interest. In this paper, the application of VCSELs in chip-scale atomic devices are reviewed, where VCSELs are integrated in various atomic bio-sensing devices with different operating environments. Secondly, the mode and polarization control of VCSELs in the specific applications are reviewed with their pros and cons discussed. In addition, various packaging of VCSEL based on different atomic devices in pursuit of miniaturization and precision measurement are reviewed and discussed. Finally, the VCSEL-based chip-scale atomic magnetometers utilized for cardiac and brain magnetometry are reviewed in detail. Nowadays, biosensors with chip integration, low power consumption, and high sensitivity are undergoing rapid industrialization, due to the growing market of medical instrumentation and portable health monitoring. It is promising that VCSEL-integrated chip-scale atomic biosensors as featured applications of this kind may experience extensive development in the near future.

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“…In the sensor described herein, the decision to use cesium as the sensing atom was informed by the expected operating temperature required to achieve optimal sensitivity, which is ≃30°C lower than that of rubidium. 20,21 Furthermore, cesium has a well-demonstrated suitability in the field of biomagnetic sensing. 22 Careful selection of the sensing atom to inform skin-safe sensor operation temperature is similarly demonstrated by room-temperature helium zero-field sensors.…”

Section: Introductionmentioning

confidence: 99%

“…The typical skin-safe temperature defined by the US FDA is a maximum of 40°C. In the sensor described herein, the decision to use cesium as the sensing atom was informed by the expected operating temperature required to achieve optimal sensitivity, which is ≃30°C lower than that of rubidium 20 , 21 . Furthermore, cesium has a well-demonstrated suitability in the field of biomagnetic sensing 22 .…”

Section: Introductionmentioning

confidence: 99%

Portable single-beam cesium zero-field magnetometer for magnetocardiography

Dawson,

O’Dwyer,

Mrozowski

et al. 2023

J. Optical Microsystems

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Optically pumped magnetometers (OPMs) are becoming common in the realm of biomagnetic measurements. We discuss the development of a prototype zero-field cesium portable OPM and its miniaturized components. Zero-field sensors operate in a very low static magnetic field environment and exploit physical effects in this regime. OPMs of this type are extremely sensitive to small magnetic fields, but they bring specific challenges to component design, material choice, and current routing. The miniaturized cesium atomic vapor cell within this sensor has been produced through integrated microfabrication techniques. The cell must be heated to 120°C for effective sensing, while the sensor external faces must be skin safe ≤40°C making it suitable for use in biomagnetic measurements. We demonstrate a heating system that results in a stable outer package temperature of 36°C after 1.5 h of 120°C cell heating. This relatively cool package temperature enables safe operation on human subjects which is particularly important in the use of multi-sensor arrays. Biplanar printed circuit board coils are presented that produce a reliable homogeneous field along three axes, compensating residual fields and occupying only a small volume within the sensor. The performance of the prototype portable sensor is characterized through a measured sensitivity of 90 fT∕ ffiffiffiffiffiffi Hz p in the 5 to 20 Hz frequency band and demonstrated through the measurement of a cardiac magnetic signal.

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Evaluation of optical parameters for a microminiature Rb vapor cell in a dual-beam SERF magnetometer

Cited by 8 publications

References 33 publications

Atomic Magnetometer Achieves Visual Salience Analysis in Drosophila

Atomic Magnetometer Achieves Visual Salience Analysis in Drosophila

Application of VCSEL in Bio-Sensing Atomic Magnetometers

Portable single-beam cesium zero-field magnetometer for magnetocardiography

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