Alliance Project

Interfacing nanophotonics circuits and atomic vapour cells


  • Prof. Tilman Pfau (Stuttgart)
  • Dr. Robert Löw (Stuttgart)
  • Prof. Uriel Levy (Hebrew University)
  • Liron Stern (Hebrew University)


This project aims on the miniaturization and integration of vapour cells with chip scale photonic systems for the purpose of enhancing light-vapor interactions. Both applicants, in Jerusalem and in Stuttgart, have already started a few years ago to study such systems in various configurations. The goal of our joint project is to investigate and construct a new generation of chip-scale integrated systems. Specifically, we are aiming to construct a variety of systems, mostly relying on two-photon excitations schemes. To that end, two avenues will be explored: 1. Cascaded and two-photon absorption using the Rb 5S-5P-4D transitions in atomic cladding wave guides: Here, both Silicon wave guides supporting the wavelength of 1529nm (Stuttgart), and SiN waveguide supporting the wavelengths of 1529nm and 780nm (Jerusalem) will be used. For the former case, the 780nm laser will illuminate the structure in a free-space configuration, whereas for the latter both signals will co (or counter) propagate in the waveguide simultaneously. The extent of transit time broadening, and van-der Waals shifts will be assessed using this configuration, with the end goal of investigating applications such as few photon switching and quantum based frequency standards. 2. Lambda (Λ) scheme electro-magnetic induced transparency (EIT) in atomic cladding micro ring resonators (ACMRRs): We will use the high intensity buildup provided by high-finesse micro ring resonators to demonstrate efficient pump-probe experiments in the Λ scheme, where both pump and probe will be in resonance with the ACMRR. The extent of the transparency window, the transition from EIT to Autler-Townes splitting, and the power levels needed to witness these effect will be assessed with the end goal of constructing a highly efficient all optical switch.