Decker M, Pertsch T, Staude I
Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Mills Road 59, Canberra, Australian Capital Territory 2601, Australia.
Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, Albert-Einstein-Str. 15, 07745 Jena, Germany.
Philos Trans A Math Phys Eng Sci. 2017 Mar 28;375(2090). doi: 10.1098/rsta.2016.0312.
We study resonant photonic-plasmonic coupling between a gold dipole nanoantenna and a silicon nanodisc supporting electric and magnetic dipolar Mie-type resonances. Specifically, we consider two different cases for the mode structure of the silicon nanodisc, namely spectrally separate and spectrally matching electric and magnetic dipolar Mie-type resonances. In the latter case, the dielectric nanoparticle scatters the far fields of a unidirectional Huygens' source. Our results reveal an anticrossing of the plasmonic dipole resonance and the magnetic Mie-type dipole resonance of the silicon nanodisc, accompanied by a clear signature of photonic-plasmonic mode hybridization in the corresponding mode profiles. These characteristics show that strong coupling is established between the two different resonant systems in the hybrid nanostructure. Furthermore, our results demonstrate that in comparison with purely metallic or dielectric nanostructures, hybrid metal-dielectric nanoresonators offer higher flexibility in tailoring the fractions of light which are transmitted, absorbed and reflected by the nanostructure over a broad range of parameters without changing its material composition. As a special case, highly asymmetric reflection and absorption properties can be achieved.This article is part of the themed issue 'New horizons for nanophotonics'.
我们研究了金偶极子纳米天线与支持电偶极和磁偶极米氏型共振的硅纳米盘之间的共振光子 - 等离子体耦合。具体而言，我们考虑了硅纳米盘模式结构的两种不同情况，即光谱分离以及光谱匹配的电偶极和磁偶极米氏型共振。在后一种情况下，介电纳米粒子散射单向惠更斯源的远场。我们的结果揭示了等离子体偶极共振与硅纳米盘的磁米氏型偶极共振的反交叉现象，同时在相应的模式轮廓中呈现出光子 - 等离子体模式杂化的清晰特征。这些特性表明在混合纳米结构中的两个不同共振系统之间建立了强耦合。此外，我们的结果表明，与纯金属或介电纳米结构相比，混合金属 - 介电纳米谐振器在不改变其材料组成的情况下，在广泛的参数范围内调整纳米结构透射、吸收和反射的光的比例方面具有更高的灵活性。作为一个特殊情况，可以实现高度不对称的反射和吸收特性。本文是主题为“纳米光子学的新视野”的特刊的一部分。
