Markovich Dmitry, Baryshnikova Kseniia, Shalin Alexander, Samusev Anton, Krasnok Alexander, Belov Pavel, Ginzburg Pavel
ITMO University, Nanophotonics and Metamaterials Department, St. Petersburg, 197101, Russia.
Tel Aviv University, School of Electrical Engineering, Tel Aviv, 69978, Israel.
Sci Rep. 2016 Mar 4;6:22546. doi: 10.1038/srep22546.
All-dielectric "magnetic light" nanophotonics based on high refractive index nanoparticles allows controlling magnetic component of light at nanoscale without having high dissipative losses. The artificial magnetic optical response of such nanoparticles originates from circular displacement currents excited inside those structures and strongly depends on geometry and dispersion of optical materials. Here an approach for enhancing of magnetic response via resonant bianisotropy effect is proposed and analyzed. The key mechanism of enhancement is based on electric-magnetic interaction between two electrically and magnetically resonant nanoparticles of all-dielectric dimer. It was shown that proper geometrical arrangement of the dimer in respect to the incident illumination direction allows flexible control over all vectorial components of the magnetic moment, tailoring the latter in the dynamical range of 100% and delivering enhancement up to 36% relative to performances of standalone spherical particles. The proposed approach provides pathways for designs of all-dielectric metamaterials and metasurfaces with strong magnetic responses.
基于高折射率纳米粒子的全介质“磁光”纳米光子学能够在纳米尺度上控制光的磁分量，且不会产生高耗散损耗。此类纳米粒子的人工磁光响应源自于在这些结构内部激发的圆位移电流，并强烈依赖于光学材料的几何形状和色散。本文提出并分析了一种通过共振双各向异性效应增强磁响应的方法。增强的关键机制基于全介质二聚体中两个电共振和磁共振纳米粒子之间的电磁相互作用。结果表明，二聚体相对于入射照明方向的适当几何排列能够灵活控制磁矩的所有矢量分量，使其在100%的动态范围内进行调整，并相对于独立球形粒子的性能实现高达36%的增强。所提出的方法为设计具有强磁响应的全介质超材料和超表面提供了途径。
