注意理论和实验之间的差距
Mind the gap between theory and experiment
摘要:
我们讨论了一些例子,有效制造的纳米结构的基础上的数值模拟可以提供额外的见解的实验。专注于等离子体,我们研究Fano谐振系统的光学捕获,现实的偶极天线近场增强,和混合纳米结构相结合的等离子体金属与折射率传感。对于这些系统,相同的实验细节可以发挥非常不同的作用,这取决于物理观测的类型。例如,粗糙度可以显著影响近场,但在远场中完全不被注意。它可以影响吸附在表面上的分子,而折射率传感可以完全不受这种粗糙度的影响。尽可能接近实验情况肯定是一项具有挑战性的任务,我们展示了一种基于SEM图像的简单方法。总而言之,弥合理论和实验之间的差距并不是一项微不足道的任务。然而,本章中介绍的一些简单步骤可以帮助构建更好地匹配实验的数值模型。
英文摘要:
We discuss some examples where numerical simulations based on effectively fabricated nanostructures can provide additional insights into an experiment. Focusing on plasmonics, we study Fano resonant systems for optical trapping, realistic dipole antennas for near-field enhancement, and hybrid nanostructures that combine plasmonic metals with dielectrics refractive index sensing. For those systems, the same experimental detail can play a very different role, depending on the type of physical observable. For example, roughness can significantly influence the near-field, but be totally unnoticed in the far-field. It can affect molecules adsorbed on the surface, while refractive index sensing can be fully immune to such roughness. Approaching the experimental situation as closely as possible is certainly a challenging task and we demonstrate a simple approach based on SEM images for that. Altogether, bridging the gap between theory and experiment is not such a trivial task. However, some of the simple steps illustrated in this chapter can help build numerical models that match the experiment better.
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