Transmission properties near Dirac-like point in two-dimensional dielectric photonic crystals
Transmission properties near Dirac-like point in two-dimensional dielectric photonic crystals
复制标题
二维介电光子晶体中类狄拉克点附近的传输特性
DOI：
10.1209/0295-5075/108/14002
复制
发表时间：
2014-10-01
期刊：
影响因子：
1.8
通讯作者：
Chen, H.
中科院分区：
文献类型：
--
作者：
Wang, X.;Jiang, H. T.;Chen, H.
研究了有限厚度二维介质光子晶体中布里渊区中心类狄拉克点附近的波输运性质。模拟和微波实验都证实了透射率几乎与样品在传播方向上的长度（L）成反比。这种透射率定律来自于圆锥形色散。由于布里渊区中心处的锥形奇点对应于零折射率，因此类狄拉克点处的场包含近似均匀场的基本分量。与此相反，在六角布里渊区的角部的狄拉克点的场包含一个非均匀驻波类场的基本组成部分。
We study the wave transport properties near the Dirac-like point at the Brillouin zone center in two-dimensional dielectric photonic crystals with finite thickness. Both simulations and microwave experiments confirm that the transmittance is nearly inversely proportional to the length (L) of the samples in the propagation direction near the Dirac-like point. This transmittance law comes from the conically shaped dispersion. Since the conical singularity at the Brillouin zone center corresponds to zero refractive index, the field at the Dirac-like point contains a basic component of nearly uniform field. In contrast, the field at the Dirac point in the corner of the hexagonal Brillouin zone contains a basic component of inhomogeneous standing-wave–like field.