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首页> 外文期刊>Nanotechnology >Intra-particle coupling and plasmon tuning of multilayer Au/dielectric/Au nanocrescents adhered to a dielectric cylinder
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Intra-particle coupling and plasmon tuning of multilayer Au/dielectric/Au nanocrescents adhered to a dielectric cylinder

机译：附着在介电圆柱体上的多层Au /介电体/ Au纳米月牙的粒子内耦合和等离子体激元调谐

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摘要

A 3D numerical study on surface plasmon resonance is presented for a multilayer Au/dielectric/Au nanocrescent structure adhered to a dielectric cylinder. Investigations are carried out on the structures coupling modes, local field enhancement (LFE) and plasmon tuning capability. The cavity coupling via the cylinder is found to be dominant in tuning the plasmon wavelength. This provides the possibility of tailoring the devices plasmon band by adjusting the cylinders size and material. By using a cylinder with higher permittivity, the plasmon peak significantly shifts to the near- or mid-infrared regime without increasing the size of the crescents, thus increase of radiation loss can be fully avoided. Extra crescent layers can also be added to the structure to induce intra-particle couplings among Au crescents and enlarge the areas of the hot-spots, without shifting the plasmon band. The LFE of the multiple-layer structure is shown to be dramatically increased through the intra-particle coupling among the Au crescents, compared with a single layer Au nanocrescent structure. Further increase of LFE can be achieved by substituting semiconductors for the dielectrics in the structure due to the charge transport at metalsemiconductor interfaces.
机译：提出了粘附在介电圆柱体上的多层Au /介电体/ Au纳米月牙结构的表面等离振子共振的3D数值研究。对结构的耦合模式，局部场增强（LFE）和等离激元调谐能力进行了研究。发现通过圆柱体的腔耦合在调谐等离激元波长中起主要作用。这提供了通过调节圆柱体的尺寸和材料来调整设备等离激元带的可能性。通过使用具有较高介电常数的圆柱体，等离激元峰会显着转移到近红外或中红外区域，而不会增加新月形的大小，因此可以完全避免辐射损失的增加。还可以在结构中添加额外的新月形层，以在Au新月形之间引起粒子内耦合，并扩大热点区域，而不会移动等离激元能带。与单层Au纳米新月形结构相比，多层结构的LFE通过Au新月形之间的颗粒内偶联而显着增加。由于金属半导体界面处的电荷传输，可以通过用半导体代替结构中的电介质来实现LFE的进一步增加。

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