• 文献标题:   Double Dirac point in a photonic graphene
  • 文献类型:   Article
  • 作  者:   QIU PP, QIU WB, LIN ZL, CHEN HB, REN JB, WANG JX, KAN Q, PAN JQ
  • 作者关键词:   photonic graphene, honeycomb lattice, band structure, double dirac point, zeroindex medium
  • 出版物名称:   JOURNAL OF PHYSICS DAPPLIED PHYSICS
  • ISSN:   0022-3727 EI 1361-6463
  • 通讯作者地址:   Huaqiao Univ
  • 被引频次:   2
  • DOI:   10.1088/1361-6463/aa7bc2
  • 出版年:   2017

▎ 摘  要

The band structure of the photonic graphene composed of an array of dielectric cylinders in air with honeycomb lattice is computed in this work. The results reveal that there is a double Dirac point at the Brillouin zone center with a frequency of 0.870 61c/a in our proposed photonic graphene structure. By using average eigen-field calculation, we demonstrate that such a photonic graphene structure possesses both zero effective permittivity and effective permeability, which implied that this structure can serve as zero-index medium. Furthermore, applications including focusing, multidirectional emission and super-coupling are numerically demonstrated with the proposed structure at the double Dirac point frequency, which further conformed the zero-index properties of the photonic graphene structure.