, University of Virginia - Department of Physics
[Host: Peter Schauss]
We present a technique for measuring the amplitude of weak microwave/rf fields of arbitrary frequency. The method uses Rydberg atoms in a vapor cell as a detection medium, and electromagnetically induced transparency (EIT) spectroscopy as an optical readout. Unlike other schemes that rely on resonant coupling between Rydberg states , our electrometer is based on non-resonant dressing of the Rydberg atoms in combined AC and DC fields. We demonstrate the technique in a room temperature Rb cell, where mixing of the AC and DC fields through the second-order Stark shift produces sidebands in the EIT signal, flanking the primary resonance feature associated with the optical 5p – 32s transition. The spectral location of the sidebands reveals the frequency of the AC field. The ratio of the sideband intensity to that of the central EIT feature gives the AC field amplitude through calculation. Field amplitudes less than 200 mV/cm have been measured at frequencies from 20 to 100 MHz.
 J. A. Sedlacek et al., Nat. Phys. 8, 819 (2012).
Atomic Physics Seminar
Monday, April 26, 2021
Online, Room via Zoom
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