Song Ya-Ju, Qiao Lei
Opt Express. 2020 Dec 7;28(25):37639-37653. doi: 10.1364/OE.404467.
The single-photon scattering by a V-type three-level emitter in a rectangular waveguide is studied. Here the frequency value of input photons can be large beyond the single-transverse-mode region. By using Green's function formalism, the necessary and sufficient conditions of complete transmission as well as complete reflection are derived analytically. In the region of single transverse mode, the physical mechanisms of complete transmission and complete reflection are electromagnetically induced transparency (EIT) and Fano resonance, respectively. In the region of multiple transverse modes, which are induced by the finite cross section, the quantum interference between multiple scattering pathways with different transverse modes can be used to manipulate the single-photon transport. We find that the emitter becomes transparent when the superposition of waveguide modes has zero amplitude at the position of emitter. And the perfect reflection is absent even under Fano resonance unless the input-state is in a coherent superposition state. These results may promote the development of single-photon devices with wide applicable frequency region.
研究了矩形波导中V型三能级发射体的单光子散射。这里输入光子的频率值可以很大，超出单横向模区域。通过使用格林函数形式，解析地推导了完全透射以及完全反射的充要条件。在单横向模区域，完全透射和完全反射的物理机制分别是电磁诱导透明（EIT）和法诺共振。在由有限横截面引起的多横向模区域，不同横向模的多个散射路径之间的量子干涉可用于操纵单光子传输。我们发现，当波导模式的叠加在发射体位置处的振幅为零时，发射体变得透明。并且即使在法诺共振下也不存在完美反射，除非输入态处于相干叠加态。这些结果可能会促进具有宽适用频率区域的单光子器件的发展。
