Figure 7
From: Local oscillator port embedded field enhancement resonator for Rydberg atomic heterodyne technique
The beat-note intensity as a function of the SG output power of the SIG field in the presence and absence of the resonator. The spectrum analyzer output signal showed a linear relationship with the SIG field strength. The sensing sensitivity with and without the resonator are 854.36 nV/cm\(\sqrt{\mathrm{Hz}}\) and 43 μV/cm\(\sqrt{\mathrm{Hz}}\), respectively, indicating an E-field enhancement factor of over 50 with the resonator. The error bars correspond to the standard deviation of five datasets