Abstract
We have developed a technique for creating high quality tellurite microspheres with embedded nanodiamonds (NDs) containing nitrogen-vacancy (NV) centres. This hybrid method allows fluorescence of the NVs in the NDs to be directly, rather than evanescently, coupled to the whispering gallery modes of the tellurite microspheres at room temperature. As a demonstration of its sensing potential, shifting of the resonance peaks is also demonstrated by coating a sphere surface with a liquid layer. This new approach is a robust way of creating cavities for use in quantum and sensing applications.
Highlights
As quantum information science seeks to move from laboratory-based proof of concept experiments into practical implementations, there is a need for robust and scalable quantum platforms[1]
We have developed a technique for creating high-Q tellurite microspheres with embedded NDs by heating the ND coated tellurite fibre tapers
We selected tellurite glasses as a host material for sphere fabrication since they are deformable at relatively low temperatures (400–700 °C)
Summary
Yinlan Ruan[1], Brant C. Coupling between NV centres and silica[20,21,22,23,24] or polystyrene[25] microspheres has been demonstrated In these hybrid sphere cavities, the NVs were either intrinsic to a subwavelength diamond substrate, which was positioned close to the spheres[20], or within NDs which were coated or placed on the surface of the spheres[21,25]. We have developed a technique for creating high-Q tellurite microspheres with embedded NDs by heating the ND coated tellurite fibre tapers This hybrid method allows the fluorescence emission of the NVs to be directly, rather than evanescently, coupled to the modes of the tellurite microspheres and creates an easy way to realize a robust cavity by embedding the NDs into the microspheres
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