Extending microwave-frequency electric-field detection through single transmission peak method

Abstract

The strength of microwave (MW) electric field can be observed with high precision using the standard EIT-AT techniques, when its frequency is resonant or near-resonant with the Rydberg transition frequency. As the detuning of MW field increases, the one of the transmission peaks (single peak) is easier to measure due to its increased amplitude. It can be found that the central symmetry point of the two transmission peaks f 1/2 is only related to the detuning of MW field △ MW and central symmetry points f 0 of resonant MW field, satisfying the relation f 1/2=△ MW /2+f 0. Thus, we demonstrate a single transmission peak method that the MW E-field can be determined by interval between the position of single peak and f 1/2. We use this approach to achieve the measurement of continuous frequencies ± 200 MHz bands of the MW field. The experimental results and theoretical analysis are presented to describe the effectiveness of this method. For 50 MHz < ΔMW <200 MHz, this method solves the problem that the AT splitting cannot be measured using the standard EIT-AT techniques and multiple atomic-level Rydberg atom schemes.