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Coupling nitrogen-vacancy centers in diamond to fiber-based Fabry-Pérot microcavities

机译:在Fabry-pérot微腔中耦合氮空位中心

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摘要

This thesis investigates the coupling of the fluorescence of nitrogen-vacancy (NV) centers in diamond to tunable optical microresonators at ambient conditions, in particular in the regime of Purcell enhancement. We use fiber-based, open-access Fabry-Pérot cavities optimized for high finesse and ultra-small mode volume. Different regimes of cavity enhancement are studied that are complementary to each other:udA first experiment relies on a high-finesse cavity with dielectric mirrors. The scaling laws of Purcell enhancement are explicitly demonstrated by a large-range variation of both the cavity mode volume (V = 16 − 600 µm^3 ) and the quality factor (Q = 6 · 10^3 − 2 · 10^6). We detect an enhancement of the emission spectral density by up to a factor of 300. The full potential of this resonator can be exploited with emitters having a linewidth which is narrower than the resonance linewidth of the cavity. This concept holds promise for the implementation of wavelength-tunable, narrow-band single-photon sources as well as the generation of indistinguishable single-photons at ambient conditions. However, for broad-band emitters like the NV center at room temperature, the emission lifetime is not affected noticeably in this configuration.udIn order to directly observe lifetime changes and Purcell-enhanced single-photon emission, we manufacture fiber-based cavities with silver-coated mirrors having ultra-small mode volumes, as small as V = 1.0 λ^3 = 0.34 µm^3. We demonstrate cavity-enhanced fluorescence imaging, which allows to locate and analyze several single NV centers with one cavity. The Purcell effect is evidenced by an enhanced fluorescence collection of up to 1.6 · 10^6 photons per second from single-NV centers and a tunable variation of the emission lifetime corresponding to an effective Purcell factor of up to 2. We furthermore investigate a benefcial regime of optical confinement where the Fabry-Pérot cavityudmode is combined with additional mode confinement by the diamond nanocrystal itself, enabling sub-λ^3 mode volumes. We perform simulations that predict effective Purcell factors of up to 11 for NV centers and of up to 63 for silicon-vacancy centers, revealing a great potential for bright single-photon sources and effcient spin readout at ambient conditions.
机译:本文研究了在环境条件下,尤其是在赛尔增强的条件下,金刚石中氮空位(NV)中心的荧光与可调谐光学微谐振器的耦合。我们使用基于光纤的开放式Fabry-Pérot腔,这些腔针对高精细度和超小模式体积进行了优化。研究了相互补充的不同腔增强机制: ud第一个实验依赖于具有介电镜的高精细腔。腔模式体积(V = 16 − 600 µm ^ 3)和品质因数(Q = 6·10 ^ 3 − 2·10 ^ 6)的大范围变化都明确证明了赛尔增强的定标规律。 。我们检测到发射光谱密度最多增加了300倍。可以使用线宽比谐振腔的谐振线宽更窄的发射器来利用该谐振器的全部电势。这一概念为实现波长可调的窄带单光子源以及在环境条件下产生难以区分的单光子提供了希望。但是,对于室温下的NV中心这样的宽带发射器,在这种配置下发​​射寿命不会受到明显影响。 ud为了直接观察寿命变化和赛尔增强的单光子发射,我们制造了基于光纤的腔具有超小模式体积的镀银反射镜,其体积小至V = 1.0λ^ 3 = 0.34 µm ^ 3。我们演示了腔增强的荧光成像,该成像可以定位和分析具有一个腔的多个单个NV中心。通过从单个NV中心每秒最多可收集1.6·10 ^ 6个光子,增强的荧光收集以及发射寿命的可调变化(对应于有效的Purcell因子高达2),证明了赛赛尔效应。我们进一步研究了一种有益的方法。光学约束机制,其中法布里-珀罗腔 udmode与金刚石纳米晶体本身的附加模式约束相结合,实现了亚λ^ 3模式体积。我们进行的模拟预测对NV中心有效的赛尔因子高达11,对于硅空位中心的有效珀塞尔因子高达63,这揭示了明亮的单光子源和在环境条件下有效的自旋读出的巨大潜力。

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    Kaupp Hanno S.;

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  • 年度 2017
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