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Bulletin of the American Physical Society

Cavity-Enhanced Photon Emission from a Single Germanium-Vacancy Center in a Diamond Membrane

Erika Hissong, Rasmus Høy Jensen, Yannik Fontana, He Yi, Olivier Gobron, Ilya P. Radko, Mihir K. Bhaskar, Ruffin E. Evans, César Daniel Rodríguez Rosenblueth, Alexander Huck, Ulrik L. Andersen, Lilian Childress

Published Jun 4, 2020• 0 citations
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The nitrogen-vacancy center in diamond has been explored extensively as a light-matter interface for quantum information applications, however, it is limited by low coherent photon emission and spectral instability. Here, we present a promising interface based on an alternative defect with superior optical properties (the germanium-vacancy) coupled to a finesse-11 000 fiber cavity, resulting in a ${31}_{\ensuremath{-}15}^{+11}$-fold increase in the spectral density of zero-phonon-line emission. This work sets the stage for cryogenic experiments, where we predict a measurable increase in the spontaneous emission rate.
© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Color centers in diamond have garnered significant attention for applications in integrated quantum photonics. The availability of thin (~ hundred of nanometers) diamond membranes is paramount to achieve this goal. In this paper, we describe in detail a robust, reproducible and cost effective fabrication method that enables engineering high quality thin diamond membranes with uniform distribution of germanium vacancies employing microwave plasma chemical vapor deposition. We use a combination of different germanium precursors for homogeneous doping of the membranes to increase the probability of germanium incorporation into the diamond lattice. Our fabrication methodology can be further extended to implementation of other color centers in thin diamond membranes and be used for engineering quantum photonic devices.