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We present a technique for measuring radio-frequency (RF) electric fieldstrengths with sub-wavelength resolution. We use Rydberg states of rubidiumatoms to probe the RF field. The RF field causes an energy splitting of theRydberg states via the Autler-Townes effect, and we detect the splitting viaelectromagnetically induced transparency (EIT). We use this technique tomeasure the electric field distribution inside a glass cylinder with applied RFfields at 17.04 GHz and 104.77 GHz. We achieve a spatial resolution of$\bf{\approx}$100 $\bf{\mu}$m, limited by the widths of the laser beamsutilized for the EIT spectroscopy. We numerically simulate the fields in theglass cylinder and find good agreement with the measured fields. Our resultssuggest that this technique could be applied to image fields on a small spatialscale over a large range of frequencies, up into the sub-THz regime.

Sub-Wavelength Imaging and Field Mapping via EIT and Autler-Townes Splitting In Rydberg Atoms