Xie Yuanyang, Krasavin Alexey V, Roth Diane J, Zayats Anatoly V
Department of Physics and London Centre for Nanotechnology, King's College London, London, WS2R 2LS, UK.
Nat Commun. 2025 Jan 28;16(1):1125. doi: 10.1038/s41467-024-55277-9.
Controlling scattering and routing of chiral light at the nanoscale is important for optical information processing and imaging, quantum technologies as well as optical manipulation. Here, we introduce a concept of rotating chiral dipoles in order to achieve unidirectional chiral scattering. Implementing this concept by engineering multipole excitations in helicoidal plasmonic nanoparticles, we experimentally demonstrate enantio-sensitive and highly-directional forward scattering of circularly polarised light. The intensity of this highly-directional scattering is defined by the mutual relation between the handedness of the incident light and the chirality of the structure. The concept of rotating chiral dipoles offers numerous opportunities for engineering scattering from chiral nanostructures and optical nano-antennas paving the way for innovative designs and applications of chiral light-matter interactions.
在纳米尺度上控制手性光的散射和路由对于光学信息处理与成像、量子技术以及光学操控而言至关重要。在此，我们引入旋转手性偶极子的概念以实现单向手性散射。通过在螺旋等离子体纳米颗粒中设计多极激发来实现这一概念，我们通过实验证明了圆偏振光的对映体敏感且高度定向的前向散射。这种高度定向散射的强度由入射光的旋向与结构的手性之间的相互关系所定义。旋转手性偶极子的概念为设计来自手性纳米结构和光学纳米天线的散射提供了众多机会，为手性光与物质相互作用的创新设计和应用铺平了道路。
