Fabrication of Photonic Crystal with a Diamond Structure Having an Air Cavity Defect and its Microwave Properties
Fabrication of Photonic Crystal with a Diamond Structure Having an Air Cavity Defect and its Microwave Properties
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DOI：
10.1111/j.1551-2916.2005.00478.x
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发表时间：
2005-09
影响因子：
3.9
通讯作者：
S. Kanehira;S. Kirihara;Y. Miyamoto;K. Sakoda;M. Takeda
中科院分区：
文献类型：
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作者：
S. Kanehira;S. Kirihara;Y. Miyamoto;K. Sakoda;M. Takeda
以二氧化钛基分散环氧树脂为材料，采用立体光刻技术制备了由5 × 5 × 5单元格组成、单元格尺寸为15 mm的金刚石晶格结构的三维光子晶体。金刚石晶格在14.3 ~ 15.8 GHz之间有一个完美的带隙。通过提取3个晶胞，在晶体中心引入15 mm × 45 mm × 15 mm的矩形空腔缺陷，研究其形状对电磁波局域缺陷模形成的影响。当微波正射向矩形缺陷宽边（45 mm × 15 mm）时，带隙中间出现了一个尖锐的局域模式。然而，由于缺陷腔内本征模与入射平面波之间的对称性不匹配，入射波垂直于较小侧（15 mm × 15 mm）时没有观测到局域模式。用一个简单的腔模型进行模态分析表明，谐振模式的电场在主晶格中穿透约2.4 mm。
Three-dimensional photonic crystals with a diamond lattice structure consisting of 5 × 5 × 5 unit cells with the unit cell dimension of 15 mm were fabricated using TiO2-based ceramic particles dispersed epoxy by stereolithography. The diamond lattice showed a perfect band gap between 14.3 and 15.8 GHz. An air cavity defect with a rectangular shape (15 mm × 45 mm × 15 mm) was introduced at the center of the crystal by extracting 3 unit cells in order to investigate the shape effect of the defect on the formation of localized defect modes of electromagnetic wave. When microwaves were radiated normal to the wide sides (45 mm × 15 mm) of the rectangular shape defect, a sharp localized mode appeared at the middle of the band gap. However, no localized mode was observed for incident waves normal to the smaller side (15 mm × 15 mm) because of the symmetry mismatching between internal eigenmodes in the defect cavity and incident plane waves. The mode analysis using a simple cavity model showed the penetration of the electric field of resonant modes about 2.4 mm into the host lattice.