A microfabricated optically-pumped magnetic gradiometer

Sheng, Dong; Perry, Abigail R.; Krzyzewski, Sean; Geller, S.; Kitching, John; Knappe, Svenja

doi:10.1063/1.4974349

Cited by 145 publications

(99 citation statements)

References 29 publications

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“…Hz, but in most cases, they need to be placed in a magnetically shielded room [129][130][131]. The fact, that these magnetometers do not require strong cooling systems such as SQUIDs and are easy to miniaturize which make them very promising in the field of biomagnetic sensing [132][133][134].…”

Section: Optically Pumped Atomic Magnetometersmentioning

confidence: 99%

Ultrasensitive Magnetic Field Sensors for Biomedical Applications

Murzin

Mapps

Levada

et al. 2020

Sensors

157

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The development of magnetic field sensors for biomedical applications primarily focuses on equivalent magnetic noise reduction or overall design improvement in order to make them smaller and cheaper while keeping the required values of a limit of detection. One of the cutting-edge topics today is the use of magnetic field sensors for applications such as magnetocardiography, magnetotomography, magnetomyography, magnetoneurography, or their application in point-of-care devices. This introductory review focuses on modern magnetic field sensors suitable for biomedicine applications from a physical point of view and provides an overview of recent studies in this field. Types of magnetic field sensors include direct current superconducting quantum interference devices, search coil, fluxgate, magnetoelectric, giant magneto-impedance, anisotropic/giant/tunneling magnetoresistance, optically pumped, cavity optomechanical, Hall effect, magnetoelastic, spin wave interferometry, and those based on the behavior of nitrogen-vacancy centers in the atomic lattice of diamond.

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Section: Optically Pumped Atomic Magnetometersmentioning

confidence: 99%

Ultrasensitive Magnetic Field Sensors for Biomedical Applications

Murzin

Mapps

Levada

et al. 2020

Sensors

157

View full text Add to dashboard Cite

show abstract

“…There are essentially three kinds of heating techniques used for SERF atomic magnetometers, as well as other sensitive atomic sensors: hot air heating [15][16][17][18], optical heating [4,[19][20][21] and electrical heating [9,[22][23][24][25]. Among these heating techniques, electrical heating is most flexible and efficient, and thus widely used in all kinds of atomic sensors.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Measurement of Electrical-Heating-Induced Magnetic Field for an Atomic Magnetometer

Wang

Yang

et al. 2020

Sensors

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Electrical heating elements, which are widely used to heat the vapor cell of ultrasensitive atomic magnetometers, inevitably produce a magnetic field interference. In this paper, we propose a novel measurement method of the amplitude of electrical-heating-induced magnetic field for an atomic magnetometer. In contrast to conventional methods, this method can be implemented in the atomic magnetometer itself without the need for extra magnetometers. It can distinguish between different sources of magnetic fields sensed by the atomic magnetometer, and measure the three-axis components of the magnetic field generated by the electrical heater and the temperature sensor. The experimental results demonstrate that the measurement uncertainty of the heater’s magnetic field is less than 0.2 nT along the x-axis, 1.0 nT along the y-axis, and 0.4 nT along the z-axis. The measurement uncertainty of the temperature sensor’s magnetic field is less than 0.02 nT along all three axes. This method has the advantage of measuring the in-situ magnetic field, so it is especially suitable for miniaturized and chip-scale atomic magnetometers, where the cell is extremely small and in close proximity to the heater and the temperature sensor.

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“…Известно, что в ряде практических применений размеры спектроскопических ячеек, содержащих атомы щелочных металлов, целесообразно уменьшать [1][2][3][4][5][6][7]. В работах [6,7] было продемонстрировано уменьшение нежелательного влияния оптической накачки на четырехволновые параметрические процессы в оптических ячейках микронной и субмикронной толщины.…”

Section: Introductionunclassified

Исследование взаимодействия атомов Cs с поверхностью сапфира с использованием сверхтонкой ячейки и метода вычисления второй производной спектра поглощения паров

Саргсян¹,

Вартанян²,

Саркисян³

2020

Журнал Технической Физики

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The influence of the interaction of Cs atoms with a dielectric surface on the position and shape of the hyperfine components of the D2 line at nanometer-order distances between atoms and the surface is studied. The use of a nanocell with a wedge-shaped gap made it possible to study the dependence of the shifts of all the hyperfine components of the D2 line corresponding to the transitions Fg = 3- Fe = 2, 3, 4 and Fg = 4- Fe = 3, 4, 5, on the distance L between the atoms and the sapphire surface windows in the range of 50–400 nm. At L less than 100 nm, due to the van der Waals interaction, there is a strong broadening of atomic transitions and a shift of their frequencies to the low-frequency region of the spectrum (red shift). The calculation of the second derivative (SD) of the vapor absorption spectra in the nanocell allows one to spectrally resolve the hyperfine components of the atomic transition down to L about 50 nm and measure the coefficient of the van der Waals interaction C3. It is shown that, at L <100 nm, an additional red shift occurs with increasing atomic density, while at relatively large distances between atoms and the surface L about 400 nm, an increase in atomic density causes a blue shift of the atomic transition frequencies. The above results are important in the development of miniature submicron devices containing atomic vapor of alkali metal.

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A microfabricated optically-pumped magnetic gradiometer

Cited by 145 publications

References 29 publications

Ultrasensitive Magnetic Field Sensors for Biomedical Applications

Ultrasensitive Magnetic Field Sensors for Biomedical Applications

In-Situ Measurement of Electrical-Heating-Induced Magnetic Field for an Atomic Magnetometer

Исследование взаимодействия атомов Cs с поверхностью сапфира с использованием сверхтонкой ячейки и метода вычисления второй производной спектра поглощения паров

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