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arXiv 2302.07237physics.opticsphysics.chem-phphysics.comp-phphysics.ins-det
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激发设置对提高包覆金纳米棒二聚体天线增强因子的影响

Effect of the excitation setup in the improved enhancement factor of covered-gold-nanorod-dimer antennas

Iván A. Ramos, L. M. León Hilario, María L. Pedano, Andrés A. Reynoso

摘要:

具有感测电和光学分子目标的能力的装置具有基本的和技术的兴趣。为此,已经表明,覆盖有间隙的金纳米棒二聚体纳米天线的末端可以提高增强因子(EF),该增强因子(EF)量化来自样品顶部的入射波的表面增强拉曼光谱(SERS)的纳米天线效率。在这里,由于覆盖打破了顶部-底部对称性,我们研究了来自样品底部的激发的EF的行为。这与反射衬底的存在有关,或者由于器件放置在腔场中。我们还研究了来自两个方向的波的叠加的情况下,在极限情况下,总入射场的一个节点或一个波腹位于中心的金纳米棒。在所有这些情况下,我们发现,覆盖的设备的EF可以继续高于未覆盖的情况下,当几何参数被调谐到计算的增强因子的峰值。

英文摘要:

Devices possessing the ability to sense both electrically and optically molecular targets are of fundamental and technological interest. Towards this end, it has been shown that covering the ends of gapped gold-nanorod-dimer nanoantennas can improve the enhancement factor (EF) that quantifies the nanoantenna efficiency for surface-enhancement Raman spectroscopy (SERS) for an incident wave coming from the top of the sample. Here, as the covering breaks the top-bottom symmetry, we investigate the behaviour of the EF for excitation coming from the bottom of the sample. This is relevant in presence of a reflecting substrate or due to the placement of the device in a cavity field. We also study the case of a superposition of waves coming from both directions in the limit cases in which a node or an antinode of the total incident field lies at the center of the gold nanorods. In all these situations we find that the EF of the covered device can continue to be higher than for the uncovered case when the geometrical parameters are tuned to the peak values of the calculated enhancement factor.

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