Abstract
We present a new method for high-resolution nanoscale magnetic resonance imaging (nano-MRI) that combines the high spin sensitivity of nanowire-based magnetic resonance detection with high spectral resolution nuclear magnetic resonance (NMR) spectroscopy. By applying NMR pulses designed using optimal control theory, we demonstrate a factor of 500 reduction of the proton spin resonance linewidth in a (50-nm)3 volume of polystyrene, and image proton spins in one dimension with a spatial resolution below 2 nm.