Marcus Vinicius Santos da Silva, Denis Gilbert Francis David, Victor Mancir da Silva Santana, Christian Godet
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引用次数: 0
摘要
在模拟植物纤维拓扑结构的模型系统中研究了漫反射光谱(DRS)和光声吸收光谱(PAS),例如由定向中空通道组成的模型系统。在这一广泛的家族中,金草茎闪亮的光学特性促使人们对其化学成分、微观结构和电子特性进行详细研究。在这项研究中,我们使用二维光学模型,忽略了界面散射,研究了平行中空纤维集合内光子通量的漫反射和吸收。中空方管(HST)和平面平行膜(PPM)阵列的分析结果通过完整的光线跟踪计算得到了验证。在空气-纤维界面上具有多次反射/折射事件的光路选择性地增强了 DRS 和 PAS 强度,从而解释了黄金草闪亮的金色光泽,这与根据复折射率计算的镜面反射形成鲜明对比。本文提出了一种简单的方法,利用中空纤维拓扑结构获得的分析方程,在光电子能量损失光谱不易获取的低能区,从测量到的 PAS 和 DRS 强度中检索纤维壁的复合介电函数。
Dielectric Function of Oriented Hollow Vegetal Fibers Retrieved from XPS, Diffuse Reflection, and Photoacoustic Spectroscopies
Diffuse reflectance spectroscopy (DRS) and photoacoustic absorption spectroscopy (PAS) are investigated in model systems that mimic topological structures found in vegetal fibers, e.g., made of oriented hollow channels. Among this wide family, the shiny optical aspect of Golden grass stems has motivated detailed investigations of their chemical composition, microstructure, and electronic properties. In this work, diffuse reflectance and absorption of a photon flux within a collection of parallel hollow fibers are addressed using 2D optical models, neglecting interface scattering. Analytical results obtained for hollow square tube (HST) and plane parallel membrane (PPM) arrays are validated by full ray-tracing calculations. Optical paths with multiple reflection/refraction events at air-fiber interfaces selectively enhance DRS and PAS intensities and thus explain the shiny golden-like aspect of Golden grass, in contrast with specular reflectance calculated from the complex refractive index. A simple method is proposed to retrieve the complex dielectric function of fiber walls from the measured PAS and DRS intensities, using analytical equations obtained with hollow fiber topologies, in a low-energy region not easily accessible by photoelectron energy loss spectroscopy.
期刊介绍:
The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.