| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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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
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| Cite this article: |
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Guo-Guo Wei, Chong Miao, Hao-Chong Huang et al 2019 Chin. Phys. Lett. 36 034203 |
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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.
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Received: 19 November 2018
Published: 24 February 2019
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| PACS: |
42.25.Bs
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(Wave propagation, transmission and absorption)
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42.70.Qs
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(Photonic bandgap materials)
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11504336 and 61805214, and the Fundamental Research Funds for the Central Universities under Grant No 265201430. |
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