论文标题
可控的光学共振和核壳纳米粒子的单向散射
Controllable Optical Resonances and Unidirectional Scattering by Core-shell Nanoparticles
论文作者
论文摘要
支持一系列MIE共鸣的纳米颗粒使一类新的纳米antennans可以在纳米级操纵光线。灵活调整光学共振和散射方向性的能力对于从生物传感到纳米层的各种应用尤其重要。在本文中，我们研究了支持电和磁性MIE共振的核心壳纳米颗粒，并首次系统地揭示了从纯高索引介电纳米球到纯等离激子的模式演变，当核心壳比率从0.4增加到0.4到0.5时，它具有突然的过渡。此外，通过设计电气和磁性共振，我们在这种系统中演示了单向向后和向后散射，并通过几何调谐揭示其可调性。
Nanoparticles supporting a distinct series of Mie resonances have enabled a new class of nanoantennas and provide efficient ways to manipulate light at the nanoscale. The ability to flexibly tune the optical resonances and scattering directionality are particularly essential for various applications ranging from biosensing to nanolasers. In this paper, we investigate the core-shell nanoparticles that support both electric and magnetic Mie resonances and for the first time systematically reveal the mode evolution from a pure high-index dielectric nanosphere to a pure plasmonic one, where it has a sudden transition when core-shell ratio increases from 0.4 to 0.5. Furthermore, by engineering the electric and magnetic resonances, we demonstrate the unidirectional forward and backward scattering in such a system and reveal its tunability via geometric tuning.
