Research on the structural color, optical properties of Papilio blumei butterfly and biomimic technology

• Main Authors: Mei-ling Lo, 羅美鈴
• Other Authors: Cheng-chung Lee
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/79821193295478825386

博士 === 國立中央大學 === 光電科學與工程學系 === 102 === In this study, we aim on the research of iridescence green band and cyan tail of the wing on Papilio blumei Fruhstorferi butterfly. The wing scales consist of regular concave multilayer stack that are made from alternating chitin and chitin-air layers. The structural color found in biological systems has complicated nanostructure that it is difficult to determine its color mechanism. The FDTD (Finite-Difference Time-Domain) simulation method can help us to understand the mechanism responsible for structural color on butterfly’s wing. The variable optical constant of material, dimension of structure, and incident angle of light source lead to different reflectance spectrum. Analyze these reflectance spectra can help us to understand the hue, brightness and saturation of structural color on the butterfly wing. Those phenomena have inspired us to obtain tunable structural color by adjusting the dimension of the photonic crystal structure. Consequently, the structural color is the useful technology to reflective display application. Furthermore, the 2D photonic-crystal model can be replaced by an equivalent 1D multilayer model successfully by Bruggeman effective medium approximation. It implies the simple 1D model can be used to predict the butterfly’s color and the reflectance spectrum. Finally, the concave multilayer replica of Papilio blumei butterflies were successfully fabricated mainly by the following three steps：polystyrene spheres self-assembly, electron-beam gun deposition and inductively coupled plasma etching. The concavities array of Papilio blumei butterflies was made from alternating high and low refractive indices multilayer stack (tantalum pentoxide and silicon dioxide). Therefore, the mimic structure, iridescence color and polarization rotation effect of Papilio blumei butterfly has been manufactured and analysed.