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首页> 外文期刊>Plasmonics >The Large Near-Field Enhancement due to Strong Coupling Between the LSP on the Metal Coupled Nanodisks and on the Gold Film for Short Attosecond Pulse Generation
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The Large Near-Field Enhancement due to Strong Coupling Between the LSP on the Metal Coupled Nanodisks and on the Gold Film for Short Attosecond Pulse Generation

机译：由于LSP在金属耦合的纳米型和金膜上的LSP之间的强耦合而导致的近近场增强较短的镜片短脉冲产生

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摘要

Within a mid-IR few-cycle laser, the generation of MHz isolated attosecond pulses via nanoplasmonic field enhancement in a structure that consisted of a metal coupled nanoparticle-disk, an insulator spacer, and a thin metal film is theoretically investigated. The interaction between the localized surface plasmons caused by the coupled nanodisks and the metal layer results in increased electric field. The resonance wavelengths of these two types of surface plasmons supported by the nanostructure are tailored by changing the coupled nanoparticle-disk size and the material type. Numerical calculations are used to optimize nanostructure and attain plasmonic field enhancement factors up to 86. The HHG process is studied by the time-frequency analysis. Our studies show that only short trajectories contribute to HHG and also, the chirp of these harmonics is very low. As a result, an isolated 40 as pulse without phase compensation is obtained directly by superposing the chirp-free high-order harmonics.
机译：在中红外少周期激光器中，从理论上研究了在由金属耦合纳米颗粒盘、绝缘体间隔物和金属薄膜组成的结构中，通过纳米等离子体场增强产生MHz隔离阿秒脉冲。由耦合纳米盘和金属层引起的局域表面等离子体激元之间的相互作用导致电场增加。这两种由纳米结构支撑的表面等离子体激元的共振波长是通过改变耦合的纳米颗粒盘大小和材料类型来定制的。数值计算用于优化纳米结构，获得高达86的等离子体场增强因子。通过时频分析研究了HHG过程。我们的研究表明，只有较短的轨迹有助于HHG，而且这些谐波的啁啾非常低。因此，通过叠加无啁啾的高次谐波，可以直接获得无相位补偿的隔离40 As脉冲。

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