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arXiv 1009.4124physics.optics
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惰性气体中金属纳米结构附近等离子体增强高次谐波产生理论

Theory of plasmon-enhanced high-harmonic generation in the vicinity of metal nanostructures in noble gases

A. Husakou, S. -J. Im, J. Herrmann

摘要:

我们提出了一个在金属纳米结构附近等离子体增强高次谐波产生(HHG)的半经典模型。我们发现,增强的局部场的不均匀性和金属表面的电子吸收在HHG过程中发挥了重要作用,并导致产生偶次谐波和显着增加的截止。对于银涂层的纳米锥和蝴蝶结天线的例子,我们预测,所需的强度减少了三个数量级和HHG截止增加了两个以上的因素。增强的高次谐波产生的研究与由于等离子体激元模式的激发而引起的电场增强的有限元模拟相关联。

英文摘要:

We present a semiclassical model for plasmon-enhanced high-harmonic generation (HHG) in the vicinity of metal nanostructures. We show that both the inhomogeneity of the enhanced local fields and electron absorption by the metal surface play an important role in the HHG process and lead to the generation of even harmonics and to a significantly increased cutoff. For the examples of silver-coated nanocones and bowtie antennas we predict that the required intensity reduces by up to three orders of magnitudes and the HHG cutoff increases by more than a factor of two. The study of the enhanced high-harmonic generation is connected with a finite-element simulation of the electric field enhancement due to the excitation of the plasmonic modes.

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