Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.163901
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Funding
- NSFC [11274396]
- 973 project [2014CB931701]
- HKRGC [AOE/P-02/12]
- Guangdong Natural Science Funds for Distinguished Young Scholar [S2013050015694]
- [IRT13042]
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It is recognized that for a certain class of periodic photonic crystals, conical dispersion can be related to a zero-refractive index. It is not obvious whether such a notion can be extended to a noncrystalline system. We show that certain photonic quasicrystalline approximants have conical dispersions at the zone center with a triply degenerate state at the Dirac frequency, which is the necessary condition to qualify as a zero-refractive-index medium. The states in the conical dispersions are extended and have a nearly constant phase. Experimental characterizations of finite-sized samples show evidence that the photonic quasicrystals do behave as a near zero-refractive-index material around the Dirac frequency.
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