用穆勒矩阵光谱椭偏仪分析镜花藻角质层中的双手性结构

IF 1.9 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Arturo Mendoza-Galván, Roger Magnusson, Nicklas Jansson, Hans Arwin, Kenneth Järrendahl
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引用次数: 0

摘要

猩红甲虫科的许多甲虫都能以近似圆偏振的方式反射光线。在某些情况下,光谱窄带偏振现象会使甲虫呈现出明显的金属光泽。在其他情况下,则会出现宽带特征,这些甲虫的外观呈银色或金色。甲壳上的这些特征源于螺旋状结构,即所谓的环状布拉格结构,也称为布里甘结构。在这篇通讯中,我们使用穆勒矩阵光谱椭偏仪(MMSE)对在大约以 474 和 770 纳米波长为中心的双光谱区域中表现出近圆偏振特性的镜面蝇进行了相当详细的研究。从 MMSE 光谱的干涉振荡中提取了甲虫角质层螺旋结构的螺距轮廓,并进一步用于角质层结构的电磁建模,包括确定表角质层和外角质层的厚度(分别为 280 nm 和 8.1 μm)以及各向异性的光学特性。扫描电子显微镜证实了这些发现。分析表明,角质层最上层 4 μm 的间距几乎恒定为 310 nm,然后突然跃升到 440 nm,再逐渐增加到 575 nm。对 MMSE 光谱的和分解显示,甲虫角质层的反射效果类似于圆偏振器或介电镜,具体取决于光谱区域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dual chiral structures in the cuticle of Protaetia mirifica analyzed with Mueller matrix spectroscopic ellipsometry
Many species of beetles from the family Scarabaeidae reflect light with near-circular polarization. In some cases, spectral narrow-band polarization phenomena result in a distinct color with a metallic shine. In other cases, broad-band features are seen, and these beetles have a silvery or goldish appearance. These features in the cuticles originate from helicoidal structures, so-called circular Bragg structures and also referred to as Bouligand structures. In this communication, Protaetia mirifica, exhibiting near-circular polarization properties in dual spectral regions, centered approximately at the wavelengths of 474 and 770 nm, is investigated in considerable detail using Mueller matrix spectroscopic ellipsometry (MMSE). From interference oscillations in the MMSE spectra, the pitch profile of the helicoidal structures in the beetle cuticle is extracted and further used in electromagnetic modeling of the cuticle structure, including the determination of epicuticle and exocuticle thicknesses (280 nm and 8.1 μm, respectively) and anisotropic optical properties. These findings are confirmed by scanning electron microscopy. The analysis shows that the uppermost 4 μm of the cuticle has a nearly constant pitch of 310 nm, which abruptly jumps to 440 nm and then gradually increases up to 575 nm. Sum decompositions of MMSE spectra reveal that the beetle cuticle reflects like a circular polarizer or like a dielectric mirror, depending on the spectral region.
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来源期刊
Frontiers in Physics
Frontiers in Physics Mathematics-Mathematical Physics
CiteScore
4.50
自引率
6.50%
发文量
1215
审稿时长
12 weeks
期刊介绍: Frontiers in Physics publishes rigorously peer-reviewed research across the entire field, from experimental, to computational and theoretical physics. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, engineers and the public worldwide.
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