He Lingjuan, Shen Qian, Xu Jie, You Yun, Yu Tianbao, Shen Linfang, Deng Xiaohua
Institute of Space Science and Technology, Nanchang University, Nanchang, 330031, China.
Department of Physics, Nanchang University, Nanchang, 330031, China.
Sci Rep. 2018 May 25;8(1):8165. doi: 10.1038/s41598-018-26395-4.
Electromagnetic edge mode in a photonic crystal (PhC), which is a square array of semiconductor rods in air, is theoretically investigated for terahertz frequencies. In the PhC, gyroelectric anisotropy is introduced in the semiconductor rods by applying an external magnetic field and consequently, a degeneracy point, at which two dispersion surfaces intersect, is lifted and a new band gap is created. The edge mode sustained by the PhC possesses the character of one-way propagation, and it even can be immune to backscattering at large defect on the wavelength scale and 90° sharp bend. The properties of the one-way mode are closely dependent on the cladding layer structure of the PhC.
对一种光子晶体（PhC）中的电磁边缘模式进行了理论研究，该光子晶体是空气中半导体棒的方形阵列，用于太赫兹频率。在该光子晶体中，通过施加外部磁场在半导体棒中引入旋电各向异性，从而消除了两个色散面相交的简并点，并产生了一个新的带隙。由该光子晶体维持的边缘模式具有单向传播的特性，甚至在波长尺度上的大缺陷和90°急转弯处也能免受反向散射的影响。单向模式的特性紧密依赖于光子晶体的包层结构。
