Precise identification of Dirac-like point through a finite photonic crystal square matrix.

Precise identification of Dirac-like point through a finite photonic crystal square matrix.
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通过有限光子晶体方阵精确识别类狄拉克点

DOI:
10.1038/srep36712
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发表时间:
2016-11-18
期刊:
影响因子:
4.6
通讯作者:
Meng X
Meng X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Dong G;Zhou J;Yang X;Meng X

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通过观察有限长带状结构的最小透射谱或最大反射谱位于Dirac频率附近的现象,证明了在类Dirac点附近的1/L标度律。然而,迄今为止,还没有一种有效的方法来准确地识别Dirac-like点。在这项工作中,我们提供了一个有效的测量方法,通过一个有限的光子晶体方阵准确地识别Dirac-like点。基于介质光子晶体布里渊区中心偶然简并所产生的类Dirac-like色散,模拟和实验结果表明,有限光子晶体方阵的透射谱不仅为类Dirac点的存在提供了明确的证据,而且可以用来确定Dirac点的精确位置。锥奇异点周围的极值谱中嵌入尖点的特性。
The phenomena of the minimum transmittance spectrum or the maximum reflection spectrum located around the Dirac frequency have been observed to demonstrate the 1/L scaling law near the Dirac-like point through the finite ribbon structure. However, so far there is no effective way to identify the Dirac-like point accurately. In this work we provide an effective measurement method to identify the Dirac-like point accurately through a finite photonic crystal square matrix. Based on the Dirac-like dispersion achieved by the accidental degeneracy at the centre of the Brillouin zone of dielectric photonic crystal, both the simulated and experimental results demonstrate that the transmittance spectra through a finite photonic crystal square matrix not only provide the clear evidence for the existence of Dirac-like point but also can be used to identify the precise location of Dirac-like point by the characteristics of sharp cusps embedded in the extremum spectra surrounding the conical singularity.
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