Optical Properties of Ordered Arrays of Colloidal Micro-particles as Photonic Crystals.

经过3年的研究，我们获得了以下主要成果：我们能够建立可靠的技术来制造自组装层的有序排列的聚苯乙烯微粒，称为乳胶，直径范围从1到0.4微米利用光学显微镜、原子力显微镜和激光衍射图对六方排列的粒子层结构进行了研究。通过使用这样获得的信息，我们能够在更高的水平上提高样品质量对用现有方法制备的样品进行了斜入射偏振透射光谱的仔细测量。根据这些数据，得到了实验光子带结构将实验得到的光子能带结构与理论计算结果进行了比较，证实两者吻合较好对实验结果与理论结果之间的不一致之处，对玻璃基板的影响进行了仔细的检验，得出了考虑基板效应的矢量球波展开法几乎可以完全解释实验结果的结论总之，我们能够确定球形粒子有序阵列的完整光子带结构作为准二维光子晶体。

As the results of our 3 years research project, we have obtained the major results summarized as follows :[1] We were able to establish the reliable technique to fabricate self-assembled layers of well-ordered arrays of polystylene micro-particles, known as latex, with the diameters ranging from 1 to 0.4 microns.[2] We have examined the structures of the haxagonally-packed particle layers by means of optical microscope, atomic force microscope, and by the lazer diffraction patters. By using information thus obtained, we were able to improve the sample quality at higher level.[3] Careful measurements of the polarized transmission spectra for oblique incidense were performed on the samples prepared by the presently established method. From these data, the experimental photonic band structures have been obtained.[4] The experimental photonic band structures obtained were compared with theoretical calculation, and both of the results were confirmed to be in a fairly good agreement.[5] Some disagreemt between experimental and theoretical spec tral shapes, the effect of the glass substrate was carefully examined, and it has been concluded that the experimental results can be almost completely explained by the vector spherical wave expantion method taking account of the substrate effect.[6] In conclusion, we were able to determine complete photonic band structures of ordered arrays of spherical particles as quasi-two dimensional photonic crystals.