Barbour Russell J, Dinyari Khodadad N, Wang Hailin
Department of Physics and Oregon Centre for Optics, University of Oregon, Eugene, Oregon 97403, USA.
Opt Express. 2010 Aug 30;18(18):18968-74. doi: 10.1364/OE.18.018968.
We report the experimental realization of a composite microcavity system, in which negatively-charged nitrogen vacancy (NV) centers in diamond nanopillars couple evanescently to whispering-gallery modes (WGMs) in a deformed, non-axisymmetric silica microsphere. We show that the deformed microsphere can feature an evanescent decay length four times larger than that of a regular silica microsphere. With the enhanced evanescent coupling, WGMs can in principle couple to NV centers that are 100 to 200 nm beneath the diamond pillar surface, providing a promising avenue for exploring evanescently-coupled cavity QED systems of NV centers in ultrahigh purity diamond.
我们报道了一种复合微腔系统的实验实现，其中金刚石纳米柱中的带负电荷的氮空位（NV）中心与变形的非轴对称二氧化硅微球中的回音壁模式（WGM）发生倏逝耦合。我们表明，变形微球的倏逝衰减长度比普通二氧化硅微球大4倍。通过增强的倏逝耦合，WGM原则上可以与金刚石柱表面下方100至200 nm处的NV中心耦合，为探索超高纯度金刚石中NV中心的倏逝耦合腔量子电动力学系统提供了一条有前景的途径。
