Zero Refractive Index Properties of Two-Dimensional Photonic Crystals with Dirac Cones
Guo-Guo Wei, Chong Miao, Hao-Chong Huang, Hua Gao**
School of Science, China University of Geosciences, Beijing 100083
Abstract ：The zero refractive index properties of two-dimensional photonic crystals (PCs) are studied theoretically. Three necessary conditions for PCs to mimic the zero index materials (ZIMs) are obtained. In addition, through a comparative study of the properties for two representative PC structures with different types of Dirac cones, we find that the PC with a Dirac-like cone which meets the three necessary conditions does not behave as a ZIM in some cases. Further analysis shows that its non-zero index properties originate from the flat dispersion band. These findings clarify the fundamental physical issue of which type of Dirac cone PC can mimic a real ZIM.
收稿日期: 2018-11-19
出版日期: 2019-02-24
:
42.25.Bs
(Wave propagation, transmission and absorption)
42.70.Qs
(Photonic bandgap materials)
41.20.Jb
(Electromagnetic wave propagation; radiowave propagation)
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2019, Vol. 36 
