A Method for Adjustable Dual Frequency Based on Rydberg Atoms

We demonstrate a method for measuring electric fields through magnetic field modulation to achieve adjustable/dual frequency detection based on Rydberg atomic cell. In this method, a magnetic field is used as a tool to modulate the Rydberg level of an atom, generating new sub level splitting. The position of newly generated sub energy levels changes with the intensity of the magnetic field, resulting in a corresponding change in the detectable resonance frequency f₀ of the testing system. When the magnetic field intensity continuously changes, the corresponding resonance frequency changes. When the magnetic field strength change from 0 to 23.12 Gauss, the frequencies of electromagnetic waves change from 26.493 to 26.566 GHz. The Minimum electric field strength at f=26.502 GHz is 19.4 µV/cm, and the sensitivity is 1.25 µV·cm^-1.Hz^-1/2. Under different magnetic fields, the sensitivity of the system to different frequencies does not change much and remains basically consistent. Our method can provide a dual frequency adjustable frequency detection testing method.