Rydberg vapor cell atomic electrometry for sensing quasi-DC electric fields

We report on the use of Rydberg atoms with vapor-cell-based atomic electrometry for the detection of electric fields in the extremely low-frequency regime, specifically from DC to ELF band. One of the primary challenges encountered when utilizing vapor cells at these lower frequencies is the electric-field screening effect caused by alkali-metal atoms adsorbed on the inner surface of the container. By employing a specific coating within the vapor cell and utilizing only infrared lasers for Rydberg excitation, we successfully achieved electric-field screening on the order of seconds in a rubidium vapor cell, thereby enabling the sensitive detection of extremely low-frequency electric fields.