Unidirectional Invisibility Induced by Complex Anti-Parity–Time Symmetric Periodic Lattices

Applied Sciences

Fangmei Liu¹  Huang Guo¹  Dong Zhao¹  Ming Fang¹  Dong Zhong¹  Hui Cao²  Houhua Xiong³  Yonghong Hu³ 

[1] School of Electronics and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China;School of Mathematics and Statistics, Hubei University of Science and Technology, Xianning 437100, China;School of Nuclear Technology and Chemical Biology, Hubei University of Science and Technology, Xianning 437100, China;

关键词: anti-parity-time symmetry;    unidirectional invisibility;    unidirectional laser;    lateral shift;    periodic lattice;   

DOI  :  10.3390/app9183808

来源: DOAJ

【 摘 要 】

Complex anti-parity-time symmetric periodic lattices, in a wide frequency band, can act as unidirectional invisible media. The reflection from one end is suppressed while it is enhanced from the other. Furthermore, unidirectional laser points (ULPs) which correspond to the poles of reflection from one end, arise in the parameter space composed of the permittivity and angular frequency. The phase of the reflection coefficient changes sharply near the ULPs. Subsequently, large lateral shift which is proportional to the slope of phase could be induced for the reflected beam. The study may find great applications in unidirectional invisibility, unidirectional lasers and highly sensitive sensors.

【 授权许可】

Unknown