Department of Electrical and Electronic Engineering and Computer Science, Graduate School of Science and Engineering, Ehime University, Matsuyama, 790-8577, Japan.
Fisheries Research Center, Ehime Research Institute of Agriculture, Forestry and Fisheries, 5516 Shimonada, Uwajima, Ehime, 798-0104, Japan.
Sci Rep. 2021 Jul 27;11(1):15224. doi: 10.1038/s41598-021-94737-w.
The luster is the most important characteristic of pearls, whose colors depend on periodic structures of aragonite crystal layers and conchiolin sheets. We here propose an optical model for analyzing the structural colors of pearls that includes the transmission, reflection, and scattering of light in pearls. Unlike other structural color materials, internal light scattering and its transmission are the keys to understanding the optical properties of pearls. The appearance of pearls is determined by the superposition of transmitted and reflected light. The transmission and reflection spectra of pearls calculated using the proposed model show good agreement with experimental results. We also demonstrate the rendering of images of pearls using the calculated spectra. Furthermore, the appearance of pearls with different layer thicknesses are predicted by calculation based on the optical model.
光泽是珍珠最重要的特征，其颜色取决于文石晶体层和壳角蛋白片的周期性结构。我们在这里提出了一种分析珍珠结构颜色的光学模型，该模型包括珍珠中光的透射、反射和散射。与其他结构色材料不同，内部光散射及其透射是理解珍珠光学性质的关键。珍珠的外观取决于透射光和反射光的叠加。使用所提出的模型计算得到的珍珠透射和反射光谱与实验结果吻合较好。我们还使用计算得到的光谱演示了珍珠图像的渲染。此外，根据光学模型对不同层厚度的珍珠的外观进行了预测。
