Fig. 4: The Autler-Townes (AT) splitting as a function of position along the slot channel in the PCR.
From: A photonic crystal receiver for Rydberg atom-based sensing

The zero of the distance axis corresponds to the position x = 0 at the start of the PCR slot. a The AT signal as a function of the distance from the RF input and the coupling laser detuning. b The splitting between the AT peaks as a function of the distance from the RF input.