Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers.
Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers.
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DOI：
10.1038/srep18322
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发表时间：
2015-12-10
影响因子：
4.6
通讯作者：
Maier SA
中科院分区：
文献类型：
--
作者：
Albella P;Shibanuma T;Maier SA
高折射率介电纳米颗粒显示出作为互补纳米光子学平台的高前景，这是由于与等离子体纳米结构相比，低吸收损耗以及磁共振和电共振的共存。在这里，我们探讨它们作为共振增强定向散射体的用途。我们从理论上证明，硅纳米粒子的非对称二聚体显示可调的定向散射取决于激发的频率。这是由于在每个纳米颗粒中激发的电偶极子和磁偶极子之间的干涉，从而能够控制散射光的方向。有趣的是，无论相对于二聚体轴的偏振方向如何，都可以实现这种控制;然而，偏振的差异可以改变实现定向散射的波长。我们还探讨了这种非对称纳米天线作为可调路由元件在纳米尺度上的应用，建议在光学纳米电路中的应用。
High refractive index dielectric nanoparticles show high promise as a complementary nanophotonics platform due to compared with plasmonic nanostructures low absorption losses and the co-existence of magnetic and electric resonances. Here we explore their use as resonantly enhanced directional scatterers. We theoretically demonstrate that an asymmetric dimer of silicon nanoparticles shows tuneable directional scattering depending on the frequency of excitation. This is due to the interference between electric and magnetic dipoles excited in each nanoparticle, enabling directional control of the scattered light. Interestingly, this control can be achieved regardless of the polarization direction with respect to the dimer axis; however, difference in the polarization can shift the wavelengths at which the directional scattering is achieved. We also explore the application of such an asymmetric nanoantenna as a tuneable routing element in a nanometer scale, suggesting applications in optical nanocircuitry.