Structural color generation based on grating/colloidal crystal microsphere structure
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摘要: 从结构设计、实验制备和光谱呈色性能检测等方面，对基于光栅/胶体晶体结构色的光学性质进行了深入研究。围绕实现宽色域、窄禁带、高亮度和各向异性结构的光子晶体色彩控制问题，通过重力沉降和垂直沉积自组装的方法，探索了光栅/胶体晶体微球复合光子晶体的呈色机理。采用重力沉降法，当分散液浓度为1%时，胶体微球均匀地附着在光栅上。当分散液浓度为5%时，胶体微球可以紧密排列，但不能形成单层或双层密排结构，将会沉淀多层，已观察不到光栅结构。采用垂直沉降组装法，当分散液浓度在1%时，组装效果不好，不能形成致密结构，当溶液浓度为5%时，复合结构组装效果较好，胶体晶体组装于光栅凹槽中。实验中还进行了光谱性能测试，对其颜色特性进行评价，为其在防伪印刷领域得到有效应用奠定理论与实践基础。Abstract: A thorough research of the optical properties of structural color generation based on grating/colloidal crystal was reported in terms of structural design, experimental preparation and spectral color rendering performance testing. Around realizing wide color gamut, narrow band gap, high brightness and anisotropic structure photonic crystal color control problems, the color mechanism of grating/colloidal crystal microsphere composite photonic crystals was explored by gravity deposition and vertical deposition.Taking the gravity sedimentation method, when the concentration of the dispersion was 1%, the colloidal microspheres were uniformly attached to the grating. When the concentration of the solution was 5%, the PS beads can be closely arranged, but cannot form a single layer or double. The layer structure would precipitate multiple layers and the grating structure was not observed. With the vertical settlement assembly method, when the concentration of the dispersion liquid was 1%, the assembly effect was not good and a dense structure couldn't be formed. When the solution concentration was 5%, the composite structure was assembled well, and the colloidal crystal was assembled in the grating groove. The spectral performance was tested and its color properties were evaluated, which laid a theoretical and practical foundation for its effective application in the field of anti-counterfeiting printing.
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Key words:
- photonic crystal /
- polystyrene /
- grating /
- self-assembly
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