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PP4.04 - Coupling of NV Centres in Nanodiamond to Tunable, Open-Access, Optical Microcavities 
Date/Time:
April 23, 2014   9:45am - 10:00am
 
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NV centres in diamond display remarkable spin properties, even at room temperature, and thus show promise for future quantum technologies. Their broad phonon-assisted emission spectrum, with only 4% of the light entering the zero phonon line is considered be a hindrance to this. Optical Microcavities can provide a way to manipulate their emission properties and interface with large-scale photonic networks in the future. We report the coupling of NV centres in nanodiamond to tunable open-access optical microcavities. The microcavities are formed from Fabry-Perot mirrors with hemispherical features on one mirror, which are independently manipulated. Arrays of hemispherical features are constructed by Focused Ion Beam milling, with subsequent high-reflectivity mirror coating. The narrow ion beam diameter allows us to pattern features well below the wavelength scale. As a consequence we obtain smooth features with radii of curvature on the micron scale and thus ultra-small cavity mode volumes. This is essential for the enhancement of the light-matter interaction. When coupling to these small cavities, we observe profound changes in the observed emission spectrum of the NVs at room temperature, such that up to 60% of the photons are collected from a single cavity mode. We demonstrate coupling to cavities with mode volumes down to 10 cubic wavelengths. With precise control over the cavity length, the cavity modes are tuned across the entire wavelength range of the NV spectrum. We also show how, using scanning confocal microscopy, one can observe spatial feeding of the NV emission into different cavity modes.Continuing refinement of the fabrication process will allow access to even smaller mode volumes. It is ultimately hoped that one can observe a change in the rate of spontaneous emission of the NV when coupled to the cavity, the Purcell effect. Efforts towards this, both and room and cryogenic temperatures, will be discussed.
 


 
 
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