In this work, low terahertz (THz) spectroscopic properties of defective one-dimensional graphene-dielectric photonic crystal (1D-GPC) structure are theoretically investigated and analyzed in detail. The 1D-GPC is composed of a periodic stack of graphene nanolayers separated by isotropic dielectric slabs (SiO 2 ), including an air defect as a central layer. The study is carried out using the well known transfer matrix method. Our numerical simulations showed that the suggested structure exhibits comb-like resonant peaks in the first transmission band of the 1D-GPC. These peaks are narrow, fully separated from each other and their number density increases by increasing the number of periods of the structure. Tunability of the optical characteristics of the device is also explored, taking into account the dependencies to the incidence angle, width, thickness, and refractive index of the dielectric layers, and the chemical potential of graphene sheets. Our calculations reveal that these transmission channels exhibit tunable behaviors against the parameters mentioned above. The observed spectroscopic features of the proposed structure make it an ideal candidate to realize tunable narrowband multichannel filters.

中文翻译：

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基于一维石墨烯-介电光子晶体的可调谐窄带太赫兹多通道滤波器

在这项工作中，从理论上详细研究和分析了缺陷一维石墨烯-介电光子晶体 (1D-GPC) 结构的低太赫兹 (THz) 光谱特性。1D-GPC 由周期性堆叠的石墨烯纳米层组成，这些石墨烯纳米层由各向同性介电板 (SiO 2 ) 隔开，包括作为中心层的空气缺陷。该研究是使用众所周知的传递矩阵方法进行的。我们的数值模拟表明，建议的结构在一维 GPC 的第一个传输带中表现出梳状共振峰。这些峰很窄，彼此完全分离，并且它们的数量密度随着结构周期数的增加而增加。考虑到入射角、宽度、介电层的厚度和折射率，以及石墨烯片的化学势。我们的计算表明，这些传输通道表现出针对上述参数的可调行为。所提出结构的观察到的光谱特征使其成为实现可调窄带多通道滤波器的理想候选者。