Nanometer-Scale Force Detected Nuclear Magnetic Resonance Imaging
ILLINOIS UNIV AT URBANA-CHAMPAIGN
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Nanometer-scale magnetic resonance imaging Nano-MRI has the potential to be a powerful tool to investigate and characterize materials. The goal of the proposed research program is to develop fundamentally new approaches in force-detected magnetic resonance techniques and achieve nanometer-scale nuclear spin imaging by 1 achieving sub-attonewton force sensitivity using ultra-sensitive rf nanowire mechanical resonators, 2 generating intense pulsed field gradients greater than 106 Tm on the nanometer scale, 3 developing efficient spin imaging protocols using time-dependent B0 and B1 gradients, compatible with imaging statistical polarization. During the first year of the ARO grant, we developed a new method for nanometer-scale pulsed nuclear magnetic resonance imaging and spectroscopy. In the first proof-of-concept experiments, we demonstrated two-dimensional Fourier transform images of proton spins in a polystyrene sample with 10 nm spatial resolution. This new paradigm in force-detected NMR allows well-established spectroscopic and imaging pulsed NMR techniques to be applied to the nanometer scale. In the coming year, our goal is to extend the spatial resolution to be between 1-3-nm, obtain three-dimensional tomographic images, and perform high-resolution NMR spectroscopy on the nanometer scale.
- Nuclear Physics and Elementary Particle Physics