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Volume 12
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10.3390/cryst12020199
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Article

Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals

by
Min Wu
1,
Fangmei Liu
2,
Dong Zhao
2 and
Yang Wang
2,*
1
School of Mathematics and Statistics, Hubei University of Science and Technology, Xianning 437100, China
2
School of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China
*
Author to whom correspondence should be addressed.
Crystals 2022, 12(2), 199; https://doi.org/10.3390/cryst12020199
Submission received: 29 December 2021 / Revised: 20 January 2022 / Accepted: 26 January 2022 / Published: 28 January 2022
(This article belongs to the Special Issue Photonic Crystals and Their Applications)
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Abstract

In this paper, we investigate the nonreciprocity of reflection in parity-time−symmetric (PT-symmetric) Cantor photonic crystals (PCs). Two one-dimensional PCs abiding by the Cantor sequence are PT-symmetric about the center. The PT symmetry and defect cavities in Cantor PCs can induce optical fractal states which are transmission modes. Subsequently, the left and right reflectionless states are located on both sides of a transmission peak. The invisible effect depends on the incident direction and the invisible wavelength can be modulated by the gain–loss factor. This study has potential applications in tunable optical reflectors and invisible cloaks.
Keywords: Cantor sequence; unidirectional invisibility; reflectionless photonic crystal; PT symmetry Cantor sequence; unidirectional invisibility; reflectionless photonic crystal; PT symmetry

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MDPI and ACS Style

Wu, M.; Liu, F.; Zhao, D.; Wang, Y. Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals. Crystals 2022, 12, 199. https://doi.org/10.3390/cryst12020199

AMA Style

Wu M, Liu F, Zhao D, Wang Y. Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals. Crystals. 2022; 12(2):199. https://doi.org/10.3390/cryst12020199

Chicago/Turabian Style

Wu, Min, Fangmei Liu, Dong Zhao, and Yang Wang. 2022. "Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals" Crystals 12, no. 2: 199. https://doi.org/10.3390/cryst12020199

APA Style

Wu, M., Liu, F., Zhao, D., & Wang, Y. (2022). Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals. Crystals, 12(2), 199. https://doi.org/10.3390/cryst12020199

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