RF-dressed Rydberg atoms in hollow-core fibres
  The giant electro-optical response of Rydberg atoms manifests itself in the emergence of sidebands in the Rydberg excitation spectrum if the atom is exposed to a radio-frequency (RF) electric field. Here we report on the study of RF-dressed Rydberg atoms inside hollow-core photonic crystal fibres (HC-PCF), a system that enables the use of low modulation voltages and offers the prospect of miniaturised vapour-based electro-optical devices. Narrow spectroscopic features caused by the RF field are observed for modulation frequencies up to 500 MHz. 
Christian Veit, Georg Epple, Harald K\"ubler, Tijmen G. Euser, Philip   St. J. Russell, Robert L\"ow
physics.atom-ph