球形纳米壳的非共振场增强
Off-resonance field enhancement by spherical nanoshells
摘要：
我们研究了金属/电介质复合材料的球形纳米壳层的光散射。我们考虑两种几何形状的金属纳米壳与介电核，和介电涂层金属纳米粒子。我们证明，对于这两种几何形状的局部场增强发生的共振区域（“暗态”），这，然而，可以理解的法诺共振。在最佳条件下，光在电介质材料内部被增强。利用非线性介电材料将导致各种非线性现象，适用于光子学应用。
英文摘要：
We study light scattering by spherical nanoshells consistent of metal/dielectric composites. We consider two geometries of metallic nanoshell with dielectric core, and dielectric coated metallic nanoparticle. We demonstrate that for both geometries the local field enhancement takes place out of resonance regions ("dark states"), which, nevertheless, can be understood in terms of the Fano resonance. At optimal conditions the light is stronger enhanced inside the dielectric material. By using nonlinear dielectric materials it will lead to a variety nonlinear phenomena applicable for photonics applications.
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