Multidimensional Purcell effect in an ytterbium-doped ring resonator


Rare-earth ions in solids are of particular interest for quantum information storage and processing because of the long coherence times of the 4f states1. In the past few years, substantial progress has been made by using ensembles of ions2,3,4,5,6 and single ions7,8,9,10. However, the weak optical transitions within the 4f manifold pose a great challenge to the optical interaction with a single rare-earth ion on a single-photon level. Here, we demonstrate a ninefold enhanced ion–light interaction (Purcell effect11) in an integrated-optics-based, fibre-coupled silicon nitride (Si3N4) ring resonator with implanted ytterbium ions (Yb3+). We unveil the one-, two- and three-dimensional contributions to the Purcell factor as well as the temperature-dependent decoherence and depolarization of the ions. The results indicate that this cavity quantum electrodynamics (QED) system has the potential of interfacing single rare-earth ions with single photons on a chip.

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Figure 1: Fibre-coupled Si3N4 ring resonator doped with Yb3+.
Figure 2: Energy level diagram of Yb3+ and experimental set-up.
Figure 3: Spontaneous emission (SE) decay traces.
Figure 4: Free-space decay rate and maximum Purcell factor.
Figure 5: Homogeneous linewidth and dipole polarization.


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The authors thank M.P. van Exter for scientific discussions and proofreading of the manuscript, and A.M.J. den Haan, J.J.T. Wagenaar, M. de Wit and T.H. Oosterkamp for operating the dilution refrigerator. This work is part of the research programme of the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organisation for Scientific Research (NWO). This work was supported by NWO VICI grant no. 680-47-604, NSF DMR-0960331, NSF PHY-1206118, DARPA MTO under EPHI contract HR0011-12-C-0006 and the Fund for Scientific Research–Flanders (FWO).

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J.F.B., M.J.R.H. and J.E.B. fabricated the ring resonator. L.M.C.P. and A.V. performed the ion implantation. G.W. contributed to the low-temperature measurements. D.D. designed and performed all the measurements and, with M.J.A.D. and D.B., analysed the data and wrote the manuscript.

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Correspondence to Dirk Bouwmeester.

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Ding, D., Pereira, L., Bauters, J. et al. Multidimensional Purcell effect in an ytterbium-doped ring resonator. Nature Photon 10, 385–388 (2016).

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