title: Small slot waveguide rings for on-chip quantum optical circuits.
abstract: Nanophotonic interfaces between single emitters and light promise to enable new quantum optical technologies. Here, we use a combination of finite element simulations and analytic quantum theory to investigate the interaction of various quantum emitters with slot-waveguide rings. We predict that for rings with radii as small as 1.44 μm, with a Q-factor of 27,900, near-unity emitter-waveguide coupling efficiencies and emission enhancements on the order of 1300 can be achieved. By tuning the ring geometry or introducing losses, we show that realistic emitter-ring systems can be made to be either weakly or strongly coupled, so that we can observe Rabi oscillations in the decay dynamics even for micron-sized rings. Moreover, we demonstrate that slot waveguide rings can be used to directionally couple emission, again with near-unity efficiency. Our results pave the way for integrated solid-state quantum circuits involving various emitters.
authors.forename: Nir
authors.initials: N
authors.lastname: Rotenberg
authors.forename: Pierre
authors.initials: P
authors.lastname: Türschmann
authors.forename: Harald R
authors.initials: HR
authors.lastname: Haakh
authors.forename: Diego
authors.initials: D
authors.lastname: Martin-Cano
authors.forename: Stephan
authors.initials: S
authors.lastname: Götzinger
authors.forename: Vahid
authors.initials: V
authors.lastname: Sandoghdar