Purcell-Enhanced Emission from Individual SiV${}^{-}$ Center in Nanodiamonds Coupled to a Si${}_3$N${}_4$-Based, Photonic Crystal Cavity

Abstract

Hybrid quantum photonics combines classical photonics with quantum emitters in a postprocessing step. It facilitates to link ideal quantum light sources to optimized photonic platforms. Optical cavities enable to harness the Purcell-effect boosting the device efficiency. Here, we postprocess a free-standing, crossed-waveguide photonic crystal cavity based on Si${}_3$N${}_4$ with SiV${}^{-}$ center in nanodiamonds. We develop a routine that holds the capability to optimize all degrees of freedom of the evanescent coupling term utilizing AFM nanomanipulation. After a few optimization cycles we resolve the fine-structure of individual SiV${}^{-}$ centers and achieve a Purcell enhancement of more than 4 on individual optical transitions, meaning that four out of five spontaneously emitted photons are channeled into the photonic device. Our work opens up new avenues to construct efficient quantum photonic devices.

arXiv comment7 pages, 4 figures. Nanophotonics (2020)

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• Single germanium vacancy centres in nanodiamonds with bulk-like spectral stability
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• Hybrid quantum photonics based on artificial atoms placed inside one hole of a photonic crystal cavity
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