Acta Physica Sinica, Volume. 68, Issue 22, 227803-1(2019)
Fig. 1. The structure of a honeycomb-lattice graphene-like photonic crystal. Its honeycomb unit cell is indicated in red. A ribbon of 11 dielectric cylinders along the y direction is considered and it is periodically arranged in the x direction. The photonic crystal ribbon has zigzag (S1), bearded (S2) edges. The radius of cylinders shown here is
Fig. 2. (a) A Dirac cone dispersion appears at K point for the lowest two photonic bands of the honeycomb photonic crystal structure we studied. Band 0 represents the band diagram when
Fig. 3. The energy bands for a honeycomb-graphene-like photonic crystal ribbon (the background constant
Fig. 4. Band dispersion (in red dots) of Tamm-like bearded edge states calculated using photonic crystal system with background permittivity = –10. The bulk bands are in blue dots. Their corresponding eigenfield distributions localized on bearded edge are shown in the lower panels: (a) Lower bands; (b) upper bands. 利用负背景光子晶体系统数值计算得到的局域在胡须界面上的两个Tamm态, 界面态的色散用红色和体带(蓝色)区分. 此时负背景介电常数为–10, 上体带和下体带各有一Tamm态; 其对应的本征场在下方显示 (a) 下体带; (b) 上体带
Fig. 5. In the metallic background, photonic energy bands match well with the bands (Red) calculated with effective background constant (Blue). However, Tight Binding model’s result (Green) shows small variance compared to the real bands. In the schematic cell structure, bigger circle represents dielectric cylinder, while smaller circle represents thin metallic rod inserted.金属柱背景下, 氧化铝蜂窝结构的光子能带(红色), 和其对应的背景替换为有效介质(蓝色)后得到的能带结果符合, 但用紧束缚模型(绿色)计算得到的能带略有差别. 原胞内的大圆代表介质柱, 小圆代表密集插入的细金属柱
Relationship between onsite energy, coupling ratio and parameters.
参数和位能以及耦合系数的关系
Relationship between onsite energy, coupling ratio and parameters.
参数和位能以及耦合系数的关系
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Yu-Han Mei, Yue Shao, Zhi-Hong Hang.
Received: Sep. 24, 2019
Accepted: --
Published Online: Sep. 17, 2020
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