Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 83: Poster: Enabling Technologies Sources of Quantum States of Light

FM 83.11: Poster

Thursday, September 26, 2019, 16:30–18:30, Tents

Towards monolithic diamond cavities for highly efficient photon extraction — •Lea Balzert, Philipp Fuchs, Thomas Jung, and Christoph Becher — Universität des Saarlandes, Fakultät NT - FR Physik, Campus E2.6, 66123 Saarbrücken

Color centers in diamond, e.g. the nitrogen (NV), silicon (SiV) or recently the tin (SnV) vacancy center, are promising candidates for the implementation of qubits due to the combination of long spin coherence times and optical control and read out of the spin states. Efficient collection of the emitted photons is mandatory for almost all applications, enabling e.g. enhanced signal-to-noise ratios in quantum sensing or efficient spin-photon interfaces for quantum communication. The latter further profits from fluorescence enhancement by an optical cavity allowing for cavity-assisted spin-photon transfer.

We here investigate optical cavities based on thin (< 10 µm) single crystal diamond membranes, fabricated from commercially available, high purity diamond material via reactive ion etching. The devices consist of a solid immersion lens (SIL), which is milled in the front facet of the membrane and works as spherical mirror. The unstructured back facet forms a planar mirror, enabling the whole device to work as a monolithic cavity. With appropriate coatings on both sides , we can tailor the device properties towards an efficient extraction of the emitted photons from a color center placed inside the cavity.