Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Carbon-based Nanostructures

HL 24.8: Vortrag

Dienstag, 8. März 2016, 11:45–12:00, H14

A Fully Tuneable Fabry-Perot Microcavity for Diamond-Based Photonics — •Daniel Riedel, Brendan Shields, Sebastian Starosielec, Patrick Maletinsky, and Richard J. Warburton — Department of Physics University of Basel, Basel, Switzerland

Coupling between solid-state quantum emitters and photonic channels is a critical challenge for many applications in quantum sciences. A key requirement is a high fluence of indistinguishable photons, the generation of which requires photonic engineering and high quality, solid-state hosts. Here, we present an approach to this problem in the form of a fully tuneable Fabry-Perot micro cavity. The goal is to enhance the emission rate and zero-phonon line (ZPL) collection efficiency of nitrogen vacancy (NV) centers in diamond. At the core of the device, there is a high-quality, nano-fabricated, single-crystalline diamond membrane, bonded to a highly reflective Bragg mirror; the cavity is completed by a second, concave mirror. As a result, we achieve full spectral and spatial tunability and freedom in selecting NVs with favourable emission properties. We present first results showing how the finesse, limited to a few thousand by the reflectivity of the mirrors, is not degraded by the presence of the diamond membrane, and that the linewidth of the NV centers in the membrane can be sub-GHz. Our experimentally determined key device characteristics suggest that a 100-fold Purcell enhancement of the ZPL can be achieved in the future. Our results may thereby pave the way for highly efficient NV entanglement generation and ultraprecise quantum metrology applications.