Steering the energy of the incident light into the specific directions by using plasmonic nanostructures plays a key role for future micro-nano photonic integration and optical imaging systems, but the influence of the dielectric substrate on the full-space far-field scattering image of metal nanostructures remains unintuitive. In this paper, the influence of dielectric substrate on the far-field scattering behavior of surface plasmon resonance mode is systematically investigated. By using a simple model, we found that the dielectric substrate could suppress the backscattering energy of plasmon mode. The greater the refractive index of the substrate, the stronger the inhibition effect. In addition, the forward scattering energy of plasmon mode will be concentrated as the refractive index of the substrate increased. We also realized a directional forward scattering of plasmon mode energy by combining the dielectric substrate and dielectric/metal structures. Our research provides ...

中文翻译：

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单个等离激元纳米棒的基质调制定向远场散射行为

通过使用等离激元纳米结构将入射光的能量导向特定方向，对于未来的微纳米光子集成和光学成像系统起着关键作用，但介电衬底对金属全空间远场散射像的影响纳米结构仍然不直观。本文系统地研究了电介质衬底对表面等离子体共振模式的远场散射行为的影响。通过使用一个简单的模型，我们发现电介质衬底可以抑制等离子体激元模式的反向散射能量。基材的折射率越大，抑制效果越强。另外，随着衬底折射率的增加，等离激元模式的前向散射能量将集中。通过结合电介质基板和电介质/金属结构，我们还实现了等离子体激元模式能量的定向正向散射。我们的研究提供...