Structural Coloration by Internal Reflection and Interference in Hydrogel Microbubbles and Their Precursors

被引:8
|
作者
Chen, Hong [1 ]
Zhu, Hong [1 ]
Wang, Yunqi [1 ]
Liu, Jinrun [1 ]
Wang, Yang [1 ]
Hu, Xinhua [1 ]
Solovev, Alexander A. [1 ]
Huang, Gaoshan [1 ]
Mei, Yongfeng [1 ]
机构
[1] Fudan Univ, Dept Mat Sci, 220 Handan Rd, Shanghai 200433, Peoples R China
来源
ADVANCED OPTICAL MATERIALS | 2021年 / 9卷 / 15期
关键词
internal reflection; microbubbles; structural colors; thickness evaluation; thin film interference; CONTRAST AGENTS; BUBBLE; GENE; DRUG;
D O I
10.1002/adom.202100259
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Compound microbubbles with engineered shells, fabricated by microfluidic techniques, have drawn considerable interest for interdisciplinary research, including ultrasound imaging agents, chemical micromotors, and optical microcavities. Meanwhile, though vastly investigated, dynamic shell thickness variations of microbubbles can be hardly calculated via conventional techniques. Here the fabrication of colorful microbubbles encapsulated in hydrogel precursor using glass-capillary microfluidic methods is demonstrated. The proposed optical geometrical model elucidating the structural coloration is used for thickness assessment. Thin-film interference occurring upon illumination of the microbubble shell is found to be responsible for the coloration. The interfered lights travel along with the shell interfaces through total internal reflection in microbubbles with buoyancy-induced asymmetric shell. A concise thickness evaluation methodology provided by the established model predicts the thickness evolution of microbubbles. These results demonstrate tunable optical properties of shin-shell compound microbubbles for potential applications in displays, sensing, and anti-counterfeiting materials.
引用
收藏
页数:7
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