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首页> 外文期刊>Journal of the Optical Society of America, B. Optical Physics >Investigation of the unusual surface plasmon modes and switching bandgap in three-dimensional photonic crystals with pyrochlore lattices composed of epsilon-negative materials
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Investigation of the unusual surface plasmon modes and switching bandgap in three-dimensional photonic crystals with pyrochlore lattices composed of epsilon-negative materials

机译：由ε-负材料组成的具有烧绿石晶格的三维光子晶体的异常表面等离子体激元模和转换带隙的研究

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摘要

The unusual surface plasmon modes and switching bandgap of three-dimensional (3D) photonic crystals (PCs) with pyrochlore lattices that are composed of core isotropic positive-index dielectric spheres surrounded by epsilon-negative (ENG) material shells inserted in the air are theoretically investigated in detail based on the plane wave expansion method. Numerical simulations show that the proposed double-shell structure can obtain complete photonic band gaps (PBGs) and a flatbands region. Compared to the conventional lattices, such as diamond, face-centered-cubic, body-centered-cubic, and simple-cubic lattices, a larger PBG can be achieved in the pyrochlore arrangement. It is noticed that the flatbands region is determined by the existence of surface plasmon modes. If the thickness of the ENG material shell is larger than a threshold value, the band structures of such 3D PCs will be similar to those obtained from the same structure containing pure ENG material spheres. In this case, the inserted core spheres will also not affect the band structures. It is also provided that the upper edge of the flatbands region does not depend on the topology of the lattice. Our results also demonstrate that the PBG can be manipulated by the radius of the core dielectric sphere, the dielectric constant of ENG materials, and the electronic plasma frequency, respectively. This means that the PBG can be obtained by replacing the pure ENG material spheres with such double-shell structures to save the material in the realization. Thus, such proposed 3D PCs offer a novel way to realize the potential applications.
机译：理论上，具有烧绿石晶格的三维（3D）光子晶体（PC）的异常表面等离子体激元模式和转换带隙是由插入空气中的ε-负（ENG）材料壳包围的各向同性正折射率介电球芯组成的基于平面波展开法进行了详细研究。数值模拟表明，所提出的双壳结构可以获得完整的光子带隙（PBG）和平坦带区。与常规晶格（例如菱形，面心立方，体心立方和简单立方）相比，在烧绿石排列中可以实现更大的PBG。注意，平坦带区域由表面等离子体激元模的存在确定。如果ENG材料外壳的厚度大于阈值，则此类3D PC的能带结构将类似于从包含纯ENG材料球的相同结构获得的能带结构。在这种情况下，插入的芯球也不会影响能带结构。还规定，平坦带区域的上边缘不取决于晶格的拓扑。我们的结果还表明，PBG可以分别通过核心介电球的半径，ENG材料的介电常数和电子等离子体频率来控制。这意味着可以通过用这种双壳结构代替纯ENG材料球来获得PBG，从而节省了实现所需的材料。因此，这种建议的3D PC提供了一种实现潜在应用的新颖方法。

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