Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals
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 fracta...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/2/199 |
| _version_ | 1797481459790905344 |
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| author | Min Wu Fangmei Liu Dong Zhao Yang Wang |
| author_facet | Min Wu Fangmei Liu Dong Zhao Yang Wang |
| author_sort | Min Wu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T22:14:55Z |
| format | Article |
| id | doaj.art-0d12fe25942340fbb590cd959fcc9ca4 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T22:14:55Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-0d12fe25942340fbb590cd959fcc9ca42023-11-23T19:24:32ZengMDPI AGCrystals2073-43522022-01-0112219910.3390/cryst12020199Unidirectional Invisibility in PT-Symmetric Cantor Photonic CrystalsMin Wu0Fangmei Liu1Dong Zhao2Yang Wang3School of Mathematics and Statistics, Hubei University of Science and Technology, Xianning 437100, ChinaSchool of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, ChinaSchool of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, ChinaSchool of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, ChinaIn 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.https://www.mdpi.com/2073-4352/12/2/199Cantor sequenceunidirectional invisibilityreflectionless photonic crystalPT symmetry |
| spellingShingle | Min Wu Fangmei Liu Dong Zhao Yang Wang Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals Crystals Cantor sequence unidirectional invisibility reflectionless photonic crystal PT symmetry |
| title | Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals |
| title_full | Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals |
| title_fullStr | Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals |
| title_full_unstemmed | Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals |
| title_short | Unidirectional Invisibility in PT-Symmetric Cantor Photonic Crystals |
| title_sort | unidirectional invisibility in pt symmetric cantor photonic crystals |
| topic | Cantor sequence unidirectional invisibility reflectionless photonic crystal PT symmetry |
| url | https://www.mdpi.com/2073-4352/12/2/199 |
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