Opt Lett. 2013 Dec 15;38(24):5311-4. doi: 10.1364/OL.38.005311.
We propose a novel dielectric bow-tie (DBT) nanocavity consisting of two opposing tip-to-tip triangle semiconductor nanowires, whose end faces are coated by silver nanofilms. Based on the advantages of the dielectric slot and tip structures, and the high reflectivity of the silver mirror, light can be confined in this nanocavity with low loss. We demonstrate that at 4.5 K (300 K) around the resonance wavelength of 1550 nm, the mode excited in this nanocavity has a deep subwavelength mode volume of 2.8×10(-4) μm³ and a high quality factor of 4.9×10(4) (401.3), corresponding to an ultrahigh Purcell factor of 1.6×10(7) (1.36×10(5)). This DBT nanocavity may find applications for integrated nanophotonic circuits, such as high-efficiency single photon sources, thresholdless nanolasers, and strong coupling in cavity quantum electrodynamics experiments.
我们提出了一种由两个相对的尖端到尖端三角形半导体纳米线组成的新型介电蝶形（DBT）纳米腔，其端面涂有银纳米膜。基于介电槽和尖端结构的优势，以及银镜的高反射率，光可以在这个纳米腔中以低损耗被限制。我们证明，在 4.5 K（300 K）下，在 1550nm 的共振波长附近，这个纳米腔中激发的模式具有 2.8×10(-4) μm³的深亚波长模式体积和 4.9×10(4)（401.3）的高品质因数，对应的超高品质因数为 1.6×10(7)（1.36×10(5)）。这种 DBT 纳米腔可能在集成纳米光子电路中得到应用，例如高效单光子源、无阈值纳米激光器以及腔量子电动力学实验中的强耦合。
