Liu Wei, Zhang Jianfa, Lei Bing, Ma Haotong, Xie Wenke, Hu Haojun
Opt Express. 2014 Jun 30;22(13):16178-87. doi: 10.1364/OE.22.016178.
We study the angular scattering properties of individual core-shell nanoparticles that support simultaneously both electric and optically-induced magnetic resonances of different orders. In contrast to the approach to suppress the backward scattering and enhance the forward scattering relying on overlapping electric and magnetic dipoles, we reveal that the directionality of the forward scattering can be further improved through the interferences of higher order electric and magnetic modes. Since the major contributing electric and magnetic responses can be tuned to close magnitudes, ultra-directional forward scattering can be achieved by single nanoparticles without compromising the feature of backward scattering suppression, which may offer new opportunities for nanoantennas, photovoltaic devices, bio-sensing and many other interdisciplinary researches.
我们研究了同时支持不同阶次电共振和光诱导磁共振的单个核壳纳米粒子的角散射特性。与依靠重叠电偶极子和磁偶极子来抑制后向散射并增强前向散射的方法不同，我们发现通过高阶电模和磁模的干涉可以进一步提高前向散射的方向性。由于主要的电响应和磁响应可以被调谐到相近的量级，单个纳米粒子可以在不影响后向散射抑制特性的情况下实现超定向前向散射，这可能为纳米天线、光伏器件、生物传感以及许多其他跨学科研究提供新的机会。
