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Properties of omnidirectional gap and defect mode of one-dimensional graphene-dielectric periodic structures

机译：一维石墨烯-介电周期性结构的全向间隙性质和缺陷模式

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We theoretically investigate the optical response of one-dimensional graphene based photonic crystal (1D-GPC) structures with and without defect layer in the low terahertz (THz) frequency region. The 1D-GPC is composed of alternated layers of isotropic dielectric material (SiO_2) and graphene monolayer sheets. Using the transfer matrix method (TMM), the effects of several parameters such as the incidence angle, width, thickness, and refractive index of the defect layer and the chemical potential of graphene sheets on the device response will be explored in detail for both TE and TM polarizations. Our simulation results indicate that when a defect layer is introduced, the structure may support two kinds of defect modes. One kind is created in the Bragg gap and the other one is created in the graphene-induced photonic band gap (GIPBG). Our results reveal that a defect mode can appear within the GIPBG only for an optical thickness of the defect layer greater than that of the alternated dielectric layers of the 1D-GPC. While, the defect modes in the Bragg gap may be created by simply breaking of the periodicity of the dielectric lattice. In addition, the resonance frequency of defect mode in the GIPBG is found to be almost insensitive to the incident angle for both polarizations. Moreover, we show that an effective Brewster angle for our structure can be deduced from the variation of the amplitude of defect mode with the incident angle. Our analysis has shown an innovative idea for the realization of tunable broadband reflectors and narrowband filtering devices.
机译：我们从理论上研究了在低太赫兹（THz）频率范围内具有和不具有缺陷层的一维石墨烯基光子晶体（1D-GPC）结构的光学响应。 1D-GPC由各向同性介电材料（SiO_2）和石墨烯单层板的交替层组成。使用转移矩阵方法（TMM），将详细探讨两种参数（例如缺陷层的入射角，宽度，厚度和折射率以及石墨烯片的化学势）对器件响应的影响。和TM极化。我们的仿真结果表明，当引入缺陷层时，该结构可以支持两种缺陷模式。一种在布拉格间隙中产生，另一种在石墨烯诱导的光子带隙（GIPBG）中产生。我们的结果表明，仅在缺陷层的光学厚度大于1D-GPC的交替介电层的光学厚度时，缺陷模式才能出现在GIPBG中。同时，布拉格间隙中的缺陷模式可以通过简单地破坏介电晶格的周期性来产生。另外，发现GIPBG中缺陷模式的共振频率对两种极化的入射角几乎都不敏感。此外，我们表明，可以根据缺陷模式的幅度随入射角的变化来推导我们结构的有效布鲁斯特角。我们的分析显示了实现可调谐宽带反射器和窄带滤波设备的创新想法。

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