Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry

Impurities usually play an important role in modifying the bulk properties of electronic or electromagnetic materials. In this work, we demonstrate a way to break this discipline and realize the extraordinary physical property of impurity-immunity, which leads to perfect transmission irrespective of...

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Main Authors: Jie Luo, Jensen Li, Yun Lai
Format: Article
Language:English
Published: American Physical Society 2018-08-01
Series:Physical Review X
Online Access:http://doi.org/10.1103/PhysRevX.8.031035
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spelling doaj-fd6c523251e64c41a4b2ced6d5ea467a2020-11-24T22:21:50ZengAmerican Physical SocietyPhysical Review X2160-33082018-08-018303103510.1103/PhysRevX.8.031035Electromagnetic Impurity-Immunity Induced by Parity-Time SymmetryJie LuoJensen LiYun LaiImpurities usually play an important role in modifying the bulk properties of electronic or electromagnetic materials. In this work, we demonstrate a way to break this discipline and realize the extraordinary physical property of impurity-immunity, which leads to perfect transmission irrespective of embedded impurities of almost any material and shape. This extraordinary property comes from the exceptional points of a pair of parity-time (PT)-symmetric metasurfaces sandwiching a slab of epsilon-near-zero medium. By systematically investigating the PT-symmetric metasurfaces sandwiching a slab of dielectrics or metamaterials, we obtain the two complementary solutions of exceptional points corresponding to perfect transmission. Interestingly, when the permittivity of the slab approaches zero, the two solutions of exceptional points coalesce into one exceptional point. At such a critical point, we find that the original “doping” effect of impurities in epsilon-near-zero media, proposed by Nader Engheta’s group very recently [I. Liberal et al., Science 355, 1058 (2017)SCIEAS0036-807510.1126/science.aal2672], is significantly suppressed. Our work shows that exceptional points can be used to eliminate scattering of impurities in a bulk medium.http://doi.org/10.1103/PhysRevX.8.031035
collection DOAJ
language English
format Article
sources DOAJ
author Jie Luo
Jensen Li
Yun Lai
spellingShingle Jie Luo
Jensen Li
Yun Lai
Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry
Physical Review X
author_facet Jie Luo
Jensen Li
Yun Lai
author_sort Jie Luo
title Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry
title_short Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry
title_full Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry
title_fullStr Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry
title_full_unstemmed Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry
title_sort electromagnetic impurity-immunity induced by parity-time symmetry
publisher American Physical Society
series Physical Review X
issn 2160-3308
publishDate 2018-08-01
description Impurities usually play an important role in modifying the bulk properties of electronic or electromagnetic materials. In this work, we demonstrate a way to break this discipline and realize the extraordinary physical property of impurity-immunity, which leads to perfect transmission irrespective of embedded impurities of almost any material and shape. This extraordinary property comes from the exceptional points of a pair of parity-time (PT)-symmetric metasurfaces sandwiching a slab of epsilon-near-zero medium. By systematically investigating the PT-symmetric metasurfaces sandwiching a slab of dielectrics or metamaterials, we obtain the two complementary solutions of exceptional points corresponding to perfect transmission. Interestingly, when the permittivity of the slab approaches zero, the two solutions of exceptional points coalesce into one exceptional point. At such a critical point, we find that the original “doping” effect of impurities in epsilon-near-zero media, proposed by Nader Engheta’s group very recently [I. Liberal et al., Science 355, 1058 (2017)SCIEAS0036-807510.1126/science.aal2672], is significantly suppressed. Our work shows that exceptional points can be used to eliminate scattering of impurities in a bulk medium.
url http://doi.org/10.1103/PhysRevX.8.031035
work_keys_str_mv AT jieluo electromagneticimpurityimmunityinducedbyparitytimesymmetry
AT jensenli electromagneticimpurityimmunityinducedbyparitytimesymmetry
AT yunlai electromagneticimpurityimmunityinducedbyparitytimesymmetry
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