Bright White Scattering from Protein Spheres in Color Changing, Flexible Cuttlefish Skin
Bright White Scattering from Protein Spheres in Color Changing, Flexible Cuttlefish Skin
复制标题
DOI：
10.1002/adfm.201203705
复制
发表时间：
2013-08-26
影响因子：
19
通讯作者：
Hanlon, Roger T.
中科院分区：
文献类型：
--
作者：
Maethger, Lydia M.;Senft, Stephen L.;Hanlon, Roger T.
在整个自然界中，优雅的生物光子结构已经进化成复杂的色素排列和结构反射器，这些反射器可以操纵动物皮肤、角质层、羽毛和皮毛中的光。已知的球形生物光子结构并不多，所描述的通常是角度相关的或光谱调谐的。研究了墨鱼（Sepia officinalis）柔韧皮肤对白光的散射，并研究了白细胞的独特结构和组成如何充当近似宽带朗伯表面光学特性的生理被动反射器。白细胞是一种含有数千个球形微粒的细胞，这些微粒被称为白细胞小体，由硫酸糖蛋白或蛋白聚糖和反射蛋白组成。用电子显微镜对含有约12 000个白质小体微球的白质团进行了三维表征，用全息显微镜测量了单个白质小体的平均折射率为1.51 +/- 0.02。用洛伦兹-米氏理论和蒙特卡罗模拟对超微结构数据和光谱测量进行建模表明，白团的白度是由基于随机有序系统的非相干散射产生的。这些柔软、柔顺、糖基化的蛋白质球体可以为材料科学和光学工程中高效光散射的生物启发方法提供模板。
Throughout nature, elegant biophotonic structures have evolved into sophisticated arrangements of pigments and structural reflectors that manipulate light in the skin, cuticles, feathers and fur of animals. Not many spherical biophotonic structures are known and those described are often angle dependent or spectrally tuned. White light scattering by the flexible skin of cuttlefish (Sepia officinalis) is examined and how the unique structure and composition of leucophore cells serve as physiologically passive reflectors approximating the optical properties of a broadband Lambertian surface is investigated. Leucophores are cells that contain thousands of spherical microparticles called leucosomes that consist of sulfated glycoproteins or proteoglycans and reflectin. A leucophore containing approximate to 12 000 leucosome microspheres is characterized three-dimensionally by electron microscopy and the average refractive index of individual leucosomes is measured by holographic microscopy to be 1.51 +/- 0.02. Modeling of the ultrastructural data and spectral measurements with Lorenz-Mie theory and Monte Carlo simulations suggest that leucophore whiteness is produced by incoherent scattering based upon a randomly ordered system. These soft, compliant, glycosylated proteinacious spheres may provide a template for bio-inspired approaches to efficient light scattering in materials science and optical engineering.