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Open AccessArticle

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

by 1,†, 2,†, 2,†, 2, 3,*, 2,*, 2 and 3,†
1
School of Mathematics and Statistics, Hubei University of Science and Technology, Xianning 437100, China
2
School of Electronics and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China
3
School of Nuclear Technology and Chemical Biology, Hubei University of Science and Technology, Xianning 437100, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Appl. Sci. 2019, 9(18), 3808; https://doi.org/10.3390/app9183808
Received: 3 August 2019 / Revised: 25 August 2019 / Accepted: 28 August 2019 / Published: 11 September 2019
(This article belongs to the Section Optics and Lasers)
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. View Full-Text
Keywords: anti-parity-time symmetry; unidirectional invisibility; unidirectional laser; lateral shift; periodic lattice anti-parity-time symmetry; unidirectional invisibility; unidirectional laser; lateral shift; periodic lattice
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Cao, H.; Zhao, D.; Fang, M.; Guo, H.; Hu, Y.; Liu, F.; Zhong, D.; Xiong, H. Unidirectional Invisibility Induced by Complex Anti-Parity–Time Symmetric Periodic Lattices. Appl. Sci. 2019, 9, 3808.

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