论文标题
从表面安装的量子光发射器中收集光子的靶向介电腔
Bullseye dielectric cavities for photon collection from a surface-mounted quantum-light-emitter
论文作者
论文摘要
将光从点源到传播模式的耦合光是纳米光子学的重要问题，对于量子光学元件中的许多应用至关重要。圆形的“靶心”腔是由交替折射率的同心环组成的，是一项有前途的技术，可以将近乎无限的耦合到达第一镜头。在这里，我们设计了一个适合增强染料分子，2D材料和位于这些腔表面的纳米钻石的发射的靶向结构。腔周期性设计，满足布拉格散射状况，达到22.5的percell系数，收集效率为80％。我们还解决了设计一个腔耦合到近场中低数值光纤纤维的更具挑战性的任务。使用迭代程序，我们表明，空位（非周期性）环可以达到超过周期性Bragg腔的收集效率。
Coupling light from a point source to a propagating mode is an important problem in nano-photonics and is essential for many applications in quantum optics. Circular "bullseye" cavities, consisting of concentric rings of alternating refractive index, are a promising technology that can achieve near-unity coupling into a first lens. Here we design a bullseye structure suitable for enhancing the emission from dye molecules, 2D materials and nano-diamonds positioned on the surface of these cavities. A periodic design of cavity, meeting the Bragg scattering condition, achieves a Purcell factor of 22.5 and collection efficiency of 80 %. We also tackle the more challenging task of designing a cavity for coupling to a low numerical aperture fibre in the near field. Using an iterative procedure, we show that apodized (non-periodic) rings can achieve a collection efficiency that exceeds the periodic Bragg cavity.
