Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 32: Enabling Technologies: Sources of Quantum States of Light II

FM 32.3: Talk

Dienstag, 24. September 2019, 14:45–15:00, 1010

Towards directional, ultrafast and bright single-photon sources based on color centers in diamond — •Lukas Hunold, Assegid M. Flatae, Hossam Galal, Stefano Lagomarsino, Haritha Kambalathmana, Florian Sledz, and Mario Agio — Laboratory of Nano-Optics, University of Siegen

Diamond color centers exhibit promising properties for future applications in quantum information science. For example, they have high photo-stability and narrow bandwidth at room temperature. However, their effective count-rate is still limited by non-radiative decay channels, radiation at wide angles and total internal reflection at the diamond interface.

We develop techniques to tackle these main drawbacks, mainly focused on the silicon-vacancy (SiV) color center. We create single SiV centers in a controlled manner in different diamond samples (nano-membranes, micro-membranes and bulk) in a large range of implantation fluxes and energies [1]. Position accuracy is achieved by a mask with pinholes, which enables a matrix type of implantation. We also introduce resonant plasmonic nanostructures to achieve ultrafast single-photon emission at room temperature [2] and we develop schemes for efficient electrical pumping. Finally, we show how to increase the out-coupling efficiencies of the color centers by using planar Yagi-Uda antennas [3].

References [1] S. Lagomarsino, et al., Diam. Relat. Mater. 84, 196 (2018). [2] A. M. Flatae, et al., J. Phys. Chem. Lett. 10, 11, 2874-2878 (2019). [3] H. Galal, et al., arXiv:1905.03363 (2019).