共查询到15条相似文献,搜索用时 109 毫秒
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Shingo Kanehira Soshu Kirihara Yoshinari Miyamoto Kazuaki Sakoda Mitsuo Wada Takeda 《Journal of the American Ceramic Society》2003,86(10):1691-1694
Photonic crystals with a diamond structure of epoxy lattices in which TiO2 -based ceramic particles are dispersed were fabricated by stereolithography. The periodicity of the lattice was designed to reflect electromagnetic waves in the gigahertz range. The volume fraction (β) of the dielectric lattice medium was modified from 14% to 33% by changing the rod diameter of the lattice. The photonic band gap was observed along Γ-L 〈111〉, Γ-X 〈100〉, and Γ-K 〈110〉 directions and the complete photonic band gap was formed at over β= 20%. The width of the forbidden gap increased gradually when the β increased over 14%, and reached 2.4 GHz at β= 33%. These results agreed with the band calculation using the plane wave expansion method. 相似文献
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由实验测量得到的不同写入角度下的衍射效率,通过衍射效率与折射率对比度的关系,间接得到了折射率对比度与光子晶格周期的关系.关系表明折射率对比度随晶格周期的变化确实有一极值存在.说明写入不同周期的光子晶格会有不同的折射率对比度.用不同掺铁浓度的晶体实验时发现随着掺铁浓度的增大折射率对比度的最大值也增大,并且最大值的位置向晶格周期人小的方向移动,这与理论计算结果相吻合.因此,在实验与理论上证实了折射率对比度确实与写入的光子晶格的周期和掺铁浓度有关. 相似文献
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二维光折变缺陷光子晶格的制作 总被引:3,自引:3,他引:0
研究了一种制作缺陷光子晶格的新方法,即交叉相位法。利用此方法,成功地在(2+1)维12μm×12μm的光子晶格中构造了微米量级的线缺陷和点缺陷,验证了此方法在构造缺陷光子品格的可行性和优越性。 相似文献
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Shingo Kanehira Soshu Kirihara Yoshinari Miyamoto Kazuaki Sakoda Mitsuo Wada Takeda 《Journal of the American Ceramic Society》2005,88(9):2480-2484
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. 相似文献
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Z Dang MB Breese G Recio-Sánchez S Azimi J Song H Liang A Banas V Torres-Costa RJ Martín-Palma 《Nanoscale research letters》2012,7(1):416
ABSTRACT: A method for fabrication of three-dimensional (3D) silicon nanostructures based on selective formation of porous silicon using ion beam irradiation of bulk p-type silicon followed by electrochemical etching is shown. It opens a route towards the fabrication of two-dimensional (2D) and 3D silicon-based photonic crystals with high flexibility and industrial compatibility. In this work, we present the fabrication of 2D photonic lattice and photonic slab structures and propose a process for the fabrication of 3D woodpile photonic crystals based on this approach. Simulated results of photonic band structures for the fabricated 2D photonic crystals show the presence of TE or TM gap in mid-infrared range. 相似文献