Efficient Coupling of an Ensemble of Nitrogen Vacancy Center to the Mode of a High-Q, Si3N4 Photonic Crystal Cavity
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-06-11 |
| Journal | ACS Nano |
| Authors | Konstantin G. Fehler, Anna P. Ovvyan, Nico Gruhler, Wolfram H. P. Pernice, Alexander Kubanek |
| Institutions | CeNTech, UniversitƤt Ulm |
| Citations | 34 |
Abstract
Section titled āAbstractāIntegrated nanophotonics is an emerging field with high potential for quantum technology applications such as quantum sensing or quantum networks. A desired photonics platform is Si<sub>3</sub>N<sub>4</sub> due to low-photon loss and well-established fabrication techniques. However, quantum optics applications are not yet established. Here, we investigate an approach toward Si<sub>3</sub>N<sub>4</sub>-based quantum photonics utilizing a crossed waveguide, pump-probe design. The platform enables efficient, on-chip excitation, strong background suppression, and at the same time, efficient coupling to the mode of a high- Q photonic crystal cavity. The freestanding photonic crystal cavities reach high Q-factors up to 47 Ć 10<sup>3</sup>. To test our platform, we positioned an ensemble of negatively charged nitrogen vacancy centers located in a nanodiamond within the interaction zone of the photonic crystal cavity. We quantify the efficiency of the coupling with the Ī²<sub>Ī»</sub>-factor reaching values as large as 0.71. We further demonstrate on-chip excitation of the quantum emitter with strong suppression (ā¼20 dB) of the background fluorescence. Our results unfold the potential to utilize negatively charged nitrogen vacancy centers in nanodiamonds and Si<sub>3</sub>N<sub>4</sub> platforms as an efficient, on-chip spin-photon interface in quantum photonics experiments.