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首页> 外文期刊>Physical review >Evaluation of surface roughness of metal films using plasmonic Fano resonance in attenuated total reflection
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Evaluation of surface roughness of metal films using plasmonic Fano resonance in attenuated total reflection

机译：利用等离子Fano共振评估衰减全反射中金属膜的表面粗糙度

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摘要

Attenuated total reflection (ATR) by surface plasmon polariton (SPP) is a method for evaluating the dispersion relation of SPP from the position of a dip in the reflection spectrum. However, recent studies have shown that the dips are displaced from SPP resonance because they are produced by a type of Fano resonance, i.e., the interference between the resonant reflection process accompanied by resonant excitation of SPP and the direct reflection process without resonant excitation. This result suggests that the system properties difficult to be achieved in the dispersion relation of SPP can be characterized using the ATR method. In this study, we investigate the effect of surface roughness due to nanosized dimples created in the initial stage of pitting corrosion on the ATR spectrum, from the viewpoint of Fano resonance. Using the temporal coupled-mode method, it is shown that the Fano resonance in ATR is caused by the phase change of direct reflection because of the absorption on the metal surface, and the spectral shape is determined by this phase, along with the ratio of the external (radiative) decay rate to the total decay rate of the resonant mode. Moreover, it is clarified that the internal and external decay rates extracted from the ATR spectrum provide information on corrosion, such as the effective thickness of the metal film and the randomness in dimple distribution.
机译：通过表面等离振子极化（SPP）进行的衰减全反射（ATR）是一种根据反射光谱中的凹陷位置评估SPP色散关系的方法。但是，最近的研究表明，由于凹陷是由一种范诺共振产生的，即由SPP的共振激发引起的共振反射过程与无共振激发的直接反射过程之间的干涉而引起的，因而偏离了SPP共振。该结果表明，可以使用ATR方法表征难以在SPP的分散关系中实现的系统性能。在这项研究中，我们从Fano共振的角度研究了由于点蚀开始时产生的纳米级凹痕而引起的表面粗糙度对ATR光谱的影响。使用时间耦合模式方法，表明ATR中的Fano共振是由于金属表面上的吸收而由直接反射的相变引起的，并且光谱形状是由该相以及其比率确定的。外部（辐射）衰减率到谐振模式的总衰减率。此外，可以明确的是，从ATR光谱中提取的内部和外部衰减率可提供有关腐蚀的信息，例如金属膜的有效厚度和凹痕分布的随机性。

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