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High Reflectance of Artificial Opals and Engineering Applications

机译：人造蛋白石的高反射率及其工程应用

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摘要

The artificial opals are three-dimensional photonic crystals (PCs) whose microspheres are arranged periodically in a face-centered-cubic (FCC) lattice. In this work, we investigated the reflective properties of artificial opals composed of submicron silica spheres. The finite-difference time-domain (FDTD) method for electromagnetics was used to calculate the directional-hemispherical reflectance spectra of artificial opals. Factors including structural parameters, filling dielectrics, and incident light were considered to study their effect on the reflectance. It is found that the shape, value, and position of peak of the reflectance spectra can be affected by these factors. Furthermore, by analyzing the distribution and propagation of the Poynting vectors at normal incidence of P-polarization, the high reflectance of artificial opals can be attributed to the fact that reflected light from parallel crystal face generates constructive interference to strengthen the total reflected beam. As to the engineering applications, we performed a detailed analysis of the detection sensitivity of artificial opals acting as a chemical sensor. It is found that the diameter of the spheres of artificial opals has a prominent influence on the detection sensitivity which is improved with the increase in the diameter of the spheres. This work will facilitate the design, manufacture, and application of artificial opals.
机译：人造蛋白石是三维光子晶体（PC），其微球周期性地排列在面心立方（FCC）晶格中。在这项工作中，我们研究了由亚微米二氧化硅球组成的人造蛋白石的反射特性。电磁学的时域有限差分法（FDTD）用于计算人造蛋白石的定向半球反射光谱。考虑了包括结构参数，填充电介质和入射光在内的因素，以研究它们对反射率的影响。发现反射光谱的峰的形状，值和位置可能受这些因素影响。此外，通过分析在P偏振法向入射时Poynting矢量的分布和传播，可以将人造蛋白石的高反射率归因于以下事实：来自平行晶面的反射光会产生相长干涉，从而增强全反射光束。对于工程应用，我们对用作化学传感器的人造蛋白石的检测灵敏度进行了详细分析。发现人造蛋白石的球的直径对检测灵敏度具有显着的影响，其随着球的直径的增加而改善。这项工作将促进人造蛋白石的设计，制造和应用。

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  • 来源
    《Journal of Heat Transfer》 |2017年第5期|052702.1-052702.9|共9页
  • 作者

    Yuanbin Liu; Jun Qiu; Linhua Liu;

  • 作者单位

    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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