High temporal stability and spin dynamics of individual nitrogen-vacancy (NV) centers in diamond crystals make them one of the most promising quantum emitters operating at room temperature. We demonstrate a chip-integrated cavity-coupled emission into propagating surface plasmon polariton (SPP) modes narrowing the NV center's broad emission bandwidth with enhanced coupling efficiency. The cavity resonator consists of two distributed Bragg mirrors that are built at opposite sides of the coupled NV emitter and are integrated with a dielectric-loaded SPP waveguide (DLSPPW), using electron-beam lithography of hydrogen silsesquioxane resist deposited on silver-coated silicon substrates. A quality factor of ∼70 for the cavity (full width at half maximum ∼10 nm) with full tunability of the resonance wavelength is demonstrated. An up to 42-fold decay rate enhancement of the spontaneous emission at the cavity resonance is achieved, indicating high DLSPPW mode confinement.

中文翻译：

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芯片集成等离激元腔增强单氮空位中心发射

金刚石晶体中单个氮空位（NV）中心的高时间稳定性和自旋动力学使其成为在室温下运行的最有希望的量子发射器之一。我们演示了将芯片集成的腔耦合发射转换为传播的表面等离子体激元（SPP）模式，从而缩小了NV中心的宽发射带宽，并提高了耦合效率。腔谐振器由两个分布的布拉格反射镜组成，两个反射镜分别构建在耦合的NV发射器的相对侧，并使用沉积在镀银硅基板上的氢倍半硅氧烷抗蚀剂的电子束光刻技术，与介电负载的SPP波导（DLSPPW）集成在一起。腔的品质因数约为70（半峰全宽约为10 nm），谐振波长具有完全可调性。