A5103039965- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Advanced MRI Techniques and Applications
- Functional Brain Connectivity Studies
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Neural dynamics and brain function
- EEG and Brain-Computer Interfaces
- Magnetic and transport properties of perovskites and related materials
- Magnetic Field Sensors Techniques
- Mechanical and Optical Resonators
- Electrical and Bioimpedance Tomography
- Muscle activation and electromyography studies
- Photonic and Optical Devices
- Earthquake Detection and Analysis
- Astronomical Observations and Instrumentation
- Semiconductor Lasers and Optical Devices
- Astronomy and Astrophysical Research
- Quantum and electron transport phenomena
- Electron Spin Resonance Studies
- Electromagnetic Fields and Biological Effects
- Heart Rate Variability and Autonomic Control
- Stellar, planetary, and galactic studies
- Digital Media Forensic Detection
- Congenital Heart Disease Studies
QuSpin (United States)
2016-2025
Janssen (United States)
2024
Stanford University
2024
Nottingham University Hospitals NHS Trust
2024
Hospital for Sick Children
2024
University of Nottingham
2024
Queen's Medical Centre
2024
Peking University
2024
Carleton University
2022
Parul University
2022
Fabrication techniques usually applied to microelectromechanical systems (MEMS) are used reduce the size and operating power of core physics assembly an atomic clock. With a volume 9.5mm3, fractional frequency instability 2.5×10−10 at 1s integration, dissipating less than 75mW power, device has potential bring atomically precise timing hand-held, battery-operated devices. In addition, design fabrication process allows for wafer-level structures, enabling low-cost mass-production thousands...
Using the techniques of microelectromechanical systems, we have constructed a small low-power magnetic sensor based on alkali atoms. We use coherent population trapping resonance to probe interaction atoms’ moment with field, and detect changes in flux density sensitivity 50pTHz−1∕2 at 10Hz. The has size 12mm3 dissipates 195mW power. Further improvements size, power dissipation, field are immediately foreseeable, such device could provide hand-held battery-operated magnetometer an atom...
Advances in the field of quantum sensing mean that magnetic sensors, operating at room temperature, are now able to achieve sensitivity similar cryogenically cooled devices (SQUIDs). This means temperature magnetoencephalography (MEG), with a greatly increased flexibility sensor placement can be considered. Further, these new sensors placed directly on scalp surface giving, theoretically, large increase magnitude measured signal. Here, we present recordings made using single optically-pumped...
We present a highly sensitive room-temperature atomic magnetometer (AM), designed for use in biomedical applications. The sensor head is only 2 × 5 cm3 and constructed using readily available, low-cost optical components. magnetic field resolution of the AM <10 fT Hz–1/2, which comparable to cryogenically cooled superconducting quantum interference device (SQUID) magnetometers. side-by-side comparisons between our SQUID magnetometer, show that equally high quality magnetoencephalography...
Magnetoencephalography (MEG) is a powerful technique for functional neuroimaging, offering non-invasive window on brain electrophysiology. MEG systems have traditionally been based cryogenic sensors which detect the small extracranial magnetic fields generated by synchronised current in neuronal assemblies, however, such fundamental limitations. In recent years, non-cryogenic quantum-enabled sensors, called optically-pumped magnetometers (OPMs), combination with novel techniques accurate...
Small, commercially-available Optically Pumped Magnetometers (OPMs) can be used to construct a wearable Magnetoencephalography (MEG) system that allows large head movements made during recording. The small dynamic range of these sensors however means movement in the residual static magnetic field found inside typical Magnetically Shielded Rooms (MSRs) saturate sensor outputs, rendering data unusable. This problem ameliorated by using set electromagnetic coils attenuate spatially-varying...
Optically-pumped magnetometers (OPMs) are an established alternative to superconducting sensors for magnetoencephalography (MEG), offering significant advantages including flexibility accommodate any head size, uniform coverage, free movement during scanning, better data quality and lower cost. However, OPM sensor technology remains under development; there is regarding design it not yet clear which variant will prove most effective MEG. Most OPM-MEG implementations have either used...
The optically pumped magnetometer (OPM) is a viable means to detect magnetic fields generated by human brain activity. Compared conventional detectors (superconducting quantum interference devices) OPMs are small, lightweight, flexible, and operate without cryogenics. This has led step change in instrumentation for magnetoencephalography (MEG), enabling "wearable" scanner platform, adaptable fit any head size, able acquire data whilst subjects move, offering improved quality. Although many...
Optically-pumped magnetometers (OPMs) offer the potential for a step change in magnetoencephalography (MEG) enabling wearable systems that provide improved data quality, accommodate any subject group, allow capture during movement and potentially reduce cost. However, OPM-MEG is nascent technology and, to realise its potential, it must be shown facilitate key neuroscientific measurements, such as characterisation of brain networks. Networks, connectivities underlie them, have become core...
Optically pumped magnetometers (OPMs) are an emerging lightweight and compact sensor that can measure magnetic fields generated by the human brain. OPMs enable construction of wearable magnetoencephalography (MEG) systems, which offer advantages over conventional instrumentation. However, when trying to signals at low frequency, higher levels inherent noise, interference movement artefact introduce a significant challenge. Accurate characterisation frequency brain is important for...
Spin-exchange relaxation free alkali-metal magnetometers typically operate in the regime of high optical density, presenting challenges for simple and efficient pumping detection. We describe a high-sensitivity Rb magnetometer using single elliptically polarized off-resonant laser beam. Circular component light creates relatively uniform spin polarization while linear is used to measure rotation generated by atoms. Modulation atomic direction with an oscillating magnetic field shifts...
We demonstrate a microfabricated atomic clock physics package based on coherent population trapping (CPT) the D1 line of 87Rb atoms. The occupies volume 12 mm3 and requires 195 mW power to operate at an ambient temperature 200 degrees C. Compared previous exciting D2 transition in Cs [1], this shows significantly improved short- long-term stability. instability short times is 4 x?10-11 / tau?/2 improvement over device due mainly increase resonance amplitude. At longer (tau?> 50 s), results...
A novel technique for microfabricating alkali atom vapor cells is described in which atoms are evaporated into a micromachined cell cavity through glass nozzle. of interior volume 1 mm3, containing 87Rb and buffer gas, was made this way integrated an atomic clock based on coherent population trapping. fractional frequency instability 6 x 10(-12) at 1000 s integration measured. The long-term drift the F=1, mF=0-->F=2, mF=0 hyperfine these below 5 10(-11)/day.
The fabrication and performance of a miniature optically pumped atomic magnetometer constructed with microfabricated components are discussed. This device measures the spin precession frequency Rb87 atoms to determine magnetic field by use Mx technique. It has demonstrated sensitivity fields 5pT∕Hz1∕2 for bandwidth from 1to100Hz, nearly an order magnitude improvement over our previous chip-scale magnetometer. 3dB also been increased 1kHz reconfiguring vapor cell heater.
Abstract The human brain undergoes significant functional and structural changes in the first decades of life, as foundations for cognition are laid down. However, non-invasive imaging techniques to investigate function throughout neurodevelopment limited due growth head-size with age substantial head movement young participants. Experimental designs probe also by unnatural environment typical systems impose. developments quantum technology allowed fabrication a new generation wearable...
We describe an experimental study of spin-projection noise in a high sensitivity alkali-metal magnetometer. demonstrate fourfold improvement the measurement bandwidth magnetometer using continuous quantum nondemolition measurements. Operating scalar mode with volume 2 cm3 we achieve magnetic field 22 fT/Hz(1/2) and 1.9 kHz spin polarization only 1%. Our arrangement is naturally backaction evading can be used to realize sub-fT highly polarized spin-squeezed atomic vapor.
We describe the operation and results of our first generation zero field optically pumped magnetometer (OPM) developed for biomedical applications. The OPM technology is one most promising non-cryogenic candidates to replace superconducting quantum interference device (SQUID) magnetometers in key areas biomagnetism. first-generation sensors are designed transition from a physics laboratory researchers medical community. laser optical components tightly integrated inside sensor package,...
To allow wearable magnetoencephalography (MEG) recordings to be made on unconstrained subjects the spatially inhomogeneous remnant magnetic field inside magnetically shielded room (MSR) must nulled. Previously, a large bi-planar coil system which produces uniform fields and gradients was used for this purpose. Its construction presented significant challenge, six distinct coils were wound two 1.6 × m2 planes. Here, we exploit shared symmetries produce simultaneously optimised generate...
Background Fetal magnetocardiography (fMCG) is a highly effective technique for evaluation of fetuses with life-threatening arrhythmia, but its dissemination has been constrained by the high cost and complexity Superconducting Quantum Interference Device (SQUID) instrumentation. Optically pumped magnetometers (OPMs) are promising new technology that can replace SQUIDs many applications. This study compares performance an fMCG system, utilizing OPMs operating in person-sized magnetic shield,...
Optically-pumped magnetometers (OPMs) are highly sensitive, compact magnetic field sensors, which offer a viable alternative to cryogenic sensors (superconducting quantum interference devices – SQUIDs) for magnetoencephalography (MEG). With the promise of wearable system that offers lifespan compliance, enables movement during scanning, and provides higher quality data, OPMs could drive step change in MEG instrumentation. However, this potential can only be realised if background fields...