标题：Asymmetric Light Propagation Based on Graded Photonic Crystals
作者：Wang, Linhui; Yang, Xiulun; Meng, Xiangfeng; Wang, Yurong; Chen, Shouxiang; Huang, Zhe; Dong, Guoyan
作者机构：[Wang, Linhui; Yang, Xiulun; Meng, Xiangfeng; Wang, Yurong; Chen, Shouxiang; Huang, Zhe] Shandong Univ, Dept Opt, Jinan 250100, Peoples R China.; [D 更多
通讯作者地址：[Wang, LH]Shandong Univ, Dept Opt, Jinan 250100, Peoples R China.
来源：JAPANESE JOURNAL OF APPLIED PHYSICS
摘要：This study proposes a novel graded photonic crystal structure that can be used to achieve asymmetric light propagation. This structure is obtained by changing the radius of a conventional square lattice photonic crystal. A higher contrast ratio is obtained by extending the numbers of the periods of the graded photonic crystal in the horizontal direction. The best contrast ratio almost reaches 1. The intensity at the spot where the light propagated forward converges is two orders of magnitude greater than the intensity at the optical axis of the backward transmission. Numerical results are obtained using the finite-difference time domain and plane wave methods. The proposed structure has significant application potential in optical integration. (C) 2013 The Japan Society of Applied Physics