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 (Q = 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.
@article{arxiv.1610.03299,
title = {Small slot waveguide rings for on-chip quantum optical circuits},
author = {Nir Rotenberg and Pierre Tuerschmann and Harald Haakh and Diego Martin-Cano and Stephan Goetzinger and Vahid Sandoghdar},
journal= {arXiv preprint arXiv:1610.03299},
year = {2017}
}