Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantum information: Photons and nonclassical light I
Q 38.1: Talk
Thursday, March 20, 2014, 10:30–10:45, UDL HS3038
Cooperative coupling of ultracold atoms and surface plasmons — •Matthias Mildner and Sebastian Slama — Physikalisches Institut, Universität Tübingen
Cooperative coupling between specific light modes and individual optical emitters is one of the outstanding goals in quantum technology. The extraordinary radiation properties of the participating emitters are fundamentally interesting. While this goal has been achieved using high-finesse optical cavities, cavity-free approaches that are easy to build and broadband have attracted much attention recently. In this experiment we demonstrate cooperative coupling of ultracold atoms with surface plasmons that propagate on a plane gold surface. The atoms are excited by an external laser pulse, while surface plasmons are detected via leakage radiation into the substrate of the gold layer. With a maximum Purcell enhancement of ηP,max=3.1 we deduce that a number of N≈100 atoms are coupled with high cooperativity to surface plasmons.