Broadband surface-wave transformation cloak

Guiding surface electromagnetic waves around disorder without disturbing the wave amplitude or phase is in great demand for modern photonic and plasmonic devices, but is fundamentally difficult to realize because light momentum must be conserved in a scattering event. A partial realization has been...

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Main Authors: Xu, Su, Xu, Hongyi, Gao, Hanhong, Jiang, Yuyu, Yu, Faxin, Joannopoulos, John D., Soljačić, Marin, Chen, Hongsheng, Sun, Handong, Zhang, Baile
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/81173
http://hdl.handle.net/10220/39144
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-811732023-02-28T19:25:53Z Broadband surface-wave transformation cloak Xu, Su Xu, Hongyi Gao, Hanhong Jiang, Yuyu Yu, Faxin Joannopoulos, John D. Soljačić, Marin Chen, Hongsheng Sun, Handong Zhang, Baile School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) Transformation optics Surface wave Invisibility cloaks Broadband Guiding surface electromagnetic waves around disorder without disturbing the wave amplitude or phase is in great demand for modern photonic and plasmonic devices, but is fundamentally difficult to realize because light momentum must be conserved in a scattering event. A partial realization has been achieved by exploiting topological electromagnetic surface states, but this approach is limited to narrow-band light transmission and subject to phase disturbances in the presence of disorder. Recent advances in transformation optics apply principles of general relativity to curve the space for light, allowing one to match the momentum and phase of light around any disorder as if that disorder were not there. This feature has been exploited in the development of invisibility cloaks. An ideal invisibility cloak, however, would require the phase velocity of light being guided around the cloaked object to exceed the vacuum speed of light—a feat potentially achievable only over an extremely narrow band. In this work, we theoretically and experimentally show that the bottlenecks encountered in previous studies can be overcome. We introduce a class of cloaks capable of remarkable broadband surface electromagnetic waves guidance around ultrasharp corners and bumps with no perceptible changes in amplitude and phase. These cloaks consist of specifically designed nonmagnetic metamaterials and achieve nearly ideal transmission efficiency over a broadband frequency range from 0+ to 6 GHz. This work provides strong support for the application of transformation optics to plasmonic circuits and could pave the way toward high-performance, large-scale integrated photonic circuits. MOE (Min. of Education, S’pore) Accepted Version 2015-12-17T08:38:27Z 2019-12-06T14:22:58Z 2015-12-17T08:38:27Z 2019-12-06T14:22:58Z 2015 Journal Article Xu, S., Xu, H., Gao, H., Jiang, Y., Yu, F., Joannopoulos, J. D., et al. (2015). Broadband surface-wave transformation cloak. Proceedings of the National Academy of Sciences of the United States of America, 112(25), 7635-7638. https://hdl.handle.net/10356/81173 http://hdl.handle.net/10220/39144 10.1073/pnas.1508777112 26056299 en Proceedings of the National Academy of Sciences of the United States of America © 2015 The Author(s) (Published by National Academy of Sciences).This is the author created version of a work that has been peer reviewed and accepted for publication by Proceedings of the National Academy of Sciences of the United States of America, The Author(s) (Published by National Academy of Sciences). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1073/pnas.1508777112]. 21 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Transformation optics
Surface wave
Invisibility cloaks
Broadband
spellingShingle Transformation optics
Surface wave
Invisibility cloaks
Broadband
Xu, Su
Xu, Hongyi
Gao, Hanhong
Jiang, Yuyu
Yu, Faxin
Joannopoulos, John D.
Soljačić, Marin
Chen, Hongsheng
Sun, Handong
Zhang, Baile
Broadband surface-wave transformation cloak
description Guiding surface electromagnetic waves around disorder without disturbing the wave amplitude or phase is in great demand for modern photonic and plasmonic devices, but is fundamentally difficult to realize because light momentum must be conserved in a scattering event. A partial realization has been achieved by exploiting topological electromagnetic surface states, but this approach is limited to narrow-band light transmission and subject to phase disturbances in the presence of disorder. Recent advances in transformation optics apply principles of general relativity to curve the space for light, allowing one to match the momentum and phase of light around any disorder as if that disorder were not there. This feature has been exploited in the development of invisibility cloaks. An ideal invisibility cloak, however, would require the phase velocity of light being guided around the cloaked object to exceed the vacuum speed of light—a feat potentially achievable only over an extremely narrow band. In this work, we theoretically and experimentally show that the bottlenecks encountered in previous studies can be overcome. We introduce a class of cloaks capable of remarkable broadband surface electromagnetic waves guidance around ultrasharp corners and bumps with no perceptible changes in amplitude and phase. These cloaks consist of specifically designed nonmagnetic metamaterials and achieve nearly ideal transmission efficiency over a broadband frequency range from 0+ to 6 GHz. This work provides strong support for the application of transformation optics to plasmonic circuits and could pave the way toward high-performance, large-scale integrated photonic circuits.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Xu, Su
Xu, Hongyi
Gao, Hanhong
Jiang, Yuyu
Yu, Faxin
Joannopoulos, John D.
Soljačić, Marin
Chen, Hongsheng
Sun, Handong
Zhang, Baile
format Article
author Xu, Su
Xu, Hongyi
Gao, Hanhong
Jiang, Yuyu
Yu, Faxin
Joannopoulos, John D.
Soljačić, Marin
Chen, Hongsheng
Sun, Handong
Zhang, Baile
author_sort Xu, Su
title Broadband surface-wave transformation cloak
title_short Broadband surface-wave transformation cloak
title_full Broadband surface-wave transformation cloak
title_fullStr Broadband surface-wave transformation cloak
title_full_unstemmed Broadband surface-wave transformation cloak
title_sort broadband surface-wave transformation cloak
publishDate 2015
url https://hdl.handle.net/10356/81173
http://hdl.handle.net/10220/39144
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