Fabrication and Characterization of Nitrogen Vacancy Centers in Diamond Membranes for Use in Fabry-Perot Microcavities

Download or read book Fabrication and Characterization of Nitrogen Vacancy Centers in Diamond Membranes for Use in Fabry-Perot Microcavities written by Andrew Dimock and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The nitrogen vacancy (NV) center in diamond has attracted considerable attention because its electronic states combine long spin coherence times with atomic-like optical transitions in a solid-state environment. The NV- center emission consists of a coherent zero-phonon line (ZPL) transition which makes up only 4% of the total emission at cryogenic temperatures. Even with weak emission into the ZPL, the NV center has been used successfully in many groundbreaking experiments ranging from multi-qubit quantum registers to a loophole free validation of Bell's inequality. Nevertheless, the weak ZPL greatly reduces the efficiency of protocols relying on coherent photon emission, and spectral diffusion from uncontrolled local environments exacerbates the problem. The majority of the work done for this thesis was to develop a repeatable and reliable process ow - starting from a commercially available bulk diamond sample - for fabricating and characterizing individually addressable NV centers in thin diamond membranes. Such thin membranes can be incorporated into Fabry-Pérot optical cavities to enhance the relative ZPL emission. Fabry-Pérot cavities allow for the location of maximal electric field within the cavity to be overlapped with an NV center. Maximum enhancement of the ZPL is achieved if the ZPL linewidth is well within the width of the cavity mode and if the location. First, an introduction to the NV center electronic structure at room temperature and cryogenic temperatures is given. An overview of the experimental apparatus is detailed in the second chapter, followed by the ion implantation and electron irradiation process flows used for fabricating thin diamond membranes with high quality NV centers. The methods used to characterize the NV center density and measure the ZPL linewidths are outlined and the two fabrication procedures are compared with experimental data. Ion implantation membranes resulted in dense samples (0.85 NV/um^2) with linewidths averaging 450 MHz whereas the electron irradiated membranes resulted in isolated NV centers (0.05 NV/um^2) with linewidths averaging 300 MHz. This is the first demonstration of optically stable transitions in thin diamond membranes. The final chapter covers various methods for characterizing the mechanical properties of the fiber cavity mounts. Although not the ultimate fiber mount that will be used, the measurements provide insight into the motion in the cryostat and will be useful for future systems." --