超薄异质结构光子晶体实现高强度均匀红绿蓝三重反射带
High-Intensity and Uniform Red-Green-Blue Triple Reflective Bands Achieved by Rationally-Designed Ultrathin Heterostructure Photonic Crystals
摘要：
材料结构与反射光谱图案之间的关系是光子晶体的重要性质。一个特别有趣的反射率分布是高强度和均匀的三峰图案，其峰值位置正好位于红色、绿色和蓝色（RGB，三种原始颜色）区域。为了便于构造，寻求使用一维光子晶体来实现RGB三重反射带是一个有意义的努力。以前的研究非常有限，都依赖于传统的周期性光子晶体（PPC）和大厚度。基本的物理原理仍然难以捉摸，留下了实现RGB波段的厚度限制问题。在这里，我们提出了第一个详细的工作，探讨厚度限制问题的理论和实验研究的基础上。一组推导出的设计原则被用来揭示的平移对称性的破坏，从而引入异质结构光子晶体（HPC），是必不可少的，以减少总光程差（OPD）到~ 3200 nm（理论极限），同时仍然表现出高品质的RGB波段。基于12层异质结结构进行了系统的实验，很好地证实了理论预测。利用三峰效应实现了量子点的荧光增强现象。此外，HPC对溶剂刺激表现出异常的稳定性，与PPC中报道的典型行为形成强烈对比。我们的工作第一次提出并验证了重要的合理规则设计的RGB反射带的光子晶体，并提供了更广泛的探索光子晶体中的光操纵的见解。
英文摘要：
The relationships between material constructions and reflective spectrum patterns are important properties of photonic crystals. One particular interesting reflectance profile is a high-intensity and uniform three-peak pattern with peak positions right located at the red, green, and blue (RGB, three original colors) region. For ease of construction, a seek for using one-dimensional photonic crystals to achieve RGB triple reflective bands is a meaningful endeavor. Only very limited previous studies exist, all relying on traditional periodic photonic crystals (PPCs) and of large thickness. The underlying physical principles remain elusive, leaving the question of thickness limit to achieve RGB bands unaddressed. Here, we present the first detailed work to explore the thickness limit issue based on both theoretical and experimental investigation. A set of heuristically derived design principles are used to uncover that the break of translational symmetry, thus introducing heterostructure photonic crystals (HPCs), is essential to reduce the total optical path difference (OPD) to ~ 3200nm (the theoretical limit) while still exhibiting high-quality RGB bands. A systematic experiment based on a 12-layer heterostructure construction was performed and well confirmed the theoretical predictions. The associated three-peak properties are successfully used to realize quantum dot fluorescent enhancement phenomena. Furthermore, the HPC exhibits unusually stability against solvent stimulus, in strong contrast to typical behaviors reported in PPCs. Our work for the first time proposes and verifies important rational rules for designing ultrathin HPCs toward RGB reflective bands, and provides insights for a wider range of explorations of light manipulation in photonic crystals.
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