Abstract
We demonstrate experimentally two-fold enhancement of the decay rate of NV° centers on diamond/Si substrate as opposed to a bare Si substrate. We link the decay enhancement to the interplay between the excitation of substrate modes and the presence of non-radiative decay channels. We show that the radiative decay rate can vary by up to 90% depending on the thickness of the diamond film.
Highlights
The nitrogen-vacancy (NV) defect in diamond constitutes an important test ground and building block for quantum devices [1,2,3,4,5,6,7]
We argue that the changes in the lifetime distribution observed for NV centers on a diamond film are a result of strong interactions between diamond nanoparticles and guided optical modes in the diamond film
We experimentally demonstrate two-fold enhancement of the decay rate of NV0 centers in nanodiamonds when deposited on a thin diamond film
Summary
The nitrogen-vacancy (NV) defect in diamond constitutes an important test ground and building block for quantum devices [1,2,3,4,5,6,7]. Structured plasmonic films, dielectric and plasmonic particles, epsilon-near-zero media and hyperbolic metamaterials are known to enhance decay rates of quantum emitters owing to the Purcell effect [8,9,10,11,12,13,14,15,16]. We report a two-fold increase of the decay rate for ensembles of NV0 emitters resting on a thin diamond film, as compared to a bare silicon substrate, which we observed experimentally using time-resolved cathodoluminescence (TR-CL). We attribute such an increase to the existence of non-radiative channels and coupling of the emitters to Fabry-Perot modes of the thin film
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