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A: Fachverband Atomphysik

A 12: Poster I

A 12.24: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Enhancing atom-photon interaction with integrated nanophotonic resonators — •Xiaoyu Cheng — 5. Physikalisches Institut, Universität Stuttgart

We study hybrid devices consisting of thermal atomic vapor and nanophotonic structures for manipulating the interaction between atoms and photons.

We exploit cooperative effects to develop a compact, on-demand and highly efficient single-photon-source using the Rydberg blockade effect. In order to couple to the Rydberg states efficiently, the light field is locally enhanced by ultralow-loss micro-ring resonators. Due to the large spatial extent of Rydberg atoms, we carefully design the ring resonators to realize sufficient interactions between Rydberg atoms and the evanescent mode of the resonator. In order to create individual photons deterministically, we use the Four-Wave-Mixing (FWM) process in the Rydberg blockade regime to develop a single-photon-source at room temperature.

In parallel, we also explore the coherent atom-light interaction in the strong coupling regime with the help of the photonic crystal cavity (PhC). The strong field confinement and relatively high quality factor of PhCs overcome the dephasing during the short atom-light interaction period. This allows us to investigate cavity QED effects that are sensitive to single photons and single atoms. We also study topological edge states in arrays of ring resonators coupled to thermal atoms to study the effect of optical nonlinearity on the bulk and edge modes.