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Atom-photon coupling from nitrogen-vacancy centres embedded in tellurite microspheres

Ruan, Y.*; Gibson, B. C.*; Lau, D. W. M.*; Greentree, A. D.*; Ji, H.*; Ebendorff-Heidepriem, H.*; Johnson, B. C.*; Oshima, Takeshi; Monro, T. M.*

A technique for creating high quality tellurite microspheres with embedded nano-diamonds (NDs) containing nitrogen-vacancy (NV) centers was developed. TZN tellurite glass (TeO$$_{2}$$-ZnO-Na$$_{2}$$O) was fabricated in-house using the melt-quench technique and was formed to be glass fiber with a diameter of 0.16 mm. During this process, NDs with NV centers which were created by electron irradiation at 2 MeV were added into TZN tellurite glass above 690 $$^{circ}$$C. To obtain uniformly dispersed ND solutions, the NDs were processed using strong acid reflux and ultra-sonication before the mixture with TZN tellurite glass. This method can realize very bright fluorescence of the NVs in the NDs at room temperature. It is concluded that this new approach can be applied to a robust way of creating cavities for use in quantum and sensing applications.

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Category:Multidisciplinary Sciences

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