A5043288414- Atomic and Subatomic Physics Research
- Magneto-Optical Properties and Applications
- Magnetic Field Sensors Techniques
- Mechanical and Optical Resonators
- Graphene research and applications
- Solar Radiation and Photovoltaics
- Advanced Frequency and Time Standards
- Advanced Thermodynamics and Statistical Mechanics
- Cold Atom Physics and Bose-Einstein Condensates
- Solar and Space Plasma Dynamics
- 2D Materials and Applications
- Geophysics and Sensor Technology
- Quantum optics and atomic interactions
- Plasmonic and Surface Plasmon Research
- Magnetic and transport properties of perovskites and related materials
University of Colorado Boulder
2023-2025
University of Colorado System
2025
National Institute of Standards
2025
National Institute of Standards and Technology
2023-2025
Indian Institute of Science Bangalore
2019
We demonstrate how to measure in situ for heading errors of optically pumped magnetometers (OPMs) the challenging parameter regime compact vapor cells with imperfect optical pumping and high buffer gas pressure.For this, we utilize microwave-driven Ramsey Rabi frequency spectroscopy (FS) independently characterize scalar free induction decay (FID) signals.Both these approaches suppress 5-nT inaccuracies geomagnetic fields caused by nonlinear Zeeman (NLZ) shifts FID measurements below 0.6...
Abstract Flare frequency distributions represent a key approach to addressing one of the largest problems in solar and stellar physics: determining mechanism that counterintuitively heats coronae temperatures are orders magnitude hotter than corresponding photospheres. It is widely accepted magnetic field responsible for heating, but there two competing mechanisms could explain it: nanoflares or Alfvén waves. To date, neither can be directly observed. Nanoflares are, by definition, extremely...
Graphene constitutes one of the key elements in many functional van der Waals heterostructures. However, it has negligible optical visibility due to its monolayer nature. Here we study graphene various heterostructures and include effects source spectrum, oblique incidence spectral sensitivity detector obtain a realistic model. A experiment is performed at different wavelengths, resulting very good agreement with our calculations. This allows us reliably predict conditions for better The...
Alkali-metal optically-pumped magnetometers are prone to inaccuracies arising from the overlap of average F = I + 1/2 and - ground-state Zeeman resonances. We employ density-matrix simulations experiments investigate how this hyperfine systematic error varies with spin polarization in a $^{87}$Rb free-induction-decay (FID) magnetometer. At low polarizations, ($P \leq 0.5$), effect causes single-frequency magnetic-field extraction techniques exhibit up approximately 3.5 nT. Density-matrix...
Robust calibration of vector optically pumped magnetometers (OPMs) is a nontrivial task, but increasingly important for applications requiring high-accuracy such as magnetic navigation, geophysics research, and space exploration. Here, we showcase OPM that utilizes Rabi oscillations driven between the hyperfine manifolds $^{87}$Rb to measure direction DC field against polarization ellipse structure microwave field. By relying solely on atomic measurements -- free-induction decay (FID)...
We demonstrate how to measure in situ for heading errors of optically pumped magnetometers (OPMs) the challenging parameter regime compact vapor cells with imperfect optical pumping and high buffer gas pressure. For this, we utilize microwave-driven Ramsey Rabi frequency spectroscopy (FS) independently characterize scalar free induction decay (FID) signals. Both these approaches suppress 5-nT inaccuracies geomagnetic fields caused by nonlinear Zeeman (NLZ) shifts FID measurements below 0.6...