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Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones

We demonstrate the transition of band structure from flatband to type-III Dirac cones in an electromagnetically induced Kagome photonic lattice generated in a three-level Λ-type (85)Rb atomic configuration both experimentally and theoretically. Such instantaneously reconfigurable Kagome photonic lat...

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Autores principales: Yu, Qingsong, Liu, Zhenzhi, Guo, Dawei, Liang, Shun, Zhang, Yanpeng, Zhang, Zhaoyang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9504076/
https://www.ncbi.nlm.nih.gov/pubmed/36145009
http://dx.doi.org/10.3390/nano12183222
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author Yu, Qingsong
Liu, Zhenzhi
Guo, Dawei
Liang, Shun
Zhang, Yanpeng
Zhang, Zhaoyang
author_facet Yu, Qingsong
Liu, Zhenzhi
Guo, Dawei
Liang, Shun
Zhang, Yanpeng
Zhang, Zhaoyang
author_sort Yu, Qingsong
collection PubMed
description We demonstrate the transition of band structure from flatband to type-III Dirac cones in an electromagnetically induced Kagome photonic lattice generated in a three-level Λ-type (85)Rb atomic configuration both experimentally and theoretically. Such instantaneously reconfigurable Kagome photonic lattice with flatband is “written” by a strong coupling field possessing a Kagome intensity distribution, which can modulate the refractive index of atomic vapors in a spatially periodical manner under electromagnetically induced transparency. By introducing an additional one-dimensional periodic coupling field to cover any one set of the three inequivalent sublattices of the induced Kagome photonic lattice, the dispersion-less energy band can evolve into type-III Dirac cones with linear dispersion by easily manipulating the intensity of the one-dimensional field. Our results may pave a new route to engineer in situ reconfigurable photonic structures with type-III Dirac cones, which can act as promising platforms to explore the underlying physics and beam dynamics.
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spelling pubmed-95040762022-09-24 Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones Yu, Qingsong Liu, Zhenzhi Guo, Dawei Liang, Shun Zhang, Yanpeng Zhang, Zhaoyang Nanomaterials (Basel) Article We demonstrate the transition of band structure from flatband to type-III Dirac cones in an electromagnetically induced Kagome photonic lattice generated in a three-level Λ-type (85)Rb atomic configuration both experimentally and theoretically. Such instantaneously reconfigurable Kagome photonic lattice with flatband is “written” by a strong coupling field possessing a Kagome intensity distribution, which can modulate the refractive index of atomic vapors in a spatially periodical manner under electromagnetically induced transparency. By introducing an additional one-dimensional periodic coupling field to cover any one set of the three inequivalent sublattices of the induced Kagome photonic lattice, the dispersion-less energy band can evolve into type-III Dirac cones with linear dispersion by easily manipulating the intensity of the one-dimensional field. Our results may pave a new route to engineer in situ reconfigurable photonic structures with type-III Dirac cones, which can act as promising platforms to explore the underlying physics and beam dynamics. MDPI 2022-09-16 /pmc/articles/PMC9504076/ /pubmed/36145009 http://dx.doi.org/10.3390/nano12183222 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yu, Qingsong
Liu, Zhenzhi
Guo, Dawei
Liang, Shun
Zhang, Yanpeng
Zhang, Zhaoyang
Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones
title Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones
title_full Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones
title_fullStr Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones
title_full_unstemmed Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones
title_short Optically-Induced Symmetry Switching in a Reconfigurable Kagome Photonic Lattice: From Flatband to Type-III Dirac Cones
title_sort optically-induced symmetry switching in a reconfigurable kagome photonic lattice: from flatband to type-iii dirac cones
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9504076/
https://www.ncbi.nlm.nih.gov/pubmed/36145009
http://dx.doi.org/10.3390/nano12183222
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