Experimental verification of free-space singular boundary conditions in an invisibility cloak

A major issue in invisibility cloaking, which caused intense mathematical discussions in the past few years but still remains physically elusive, is the plausible singular boundary conditions associated with the singular metamaterials at the inner boundary of an invisibility cloak. The perfect cloak...

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Main Authors: Wu, Qiannan, Gao, Fei, Song, Zhengyong, Lin, Xiao, Zhang, Youming, Chen, Huanyang, Zhang, Baile
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/84534
http://hdl.handle.net/10220/43594
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-845342023-02-28T19:33:20Z Experimental verification of free-space singular boundary conditions in an invisibility cloak Wu, Qiannan Gao, Fei Song, Zhengyong Lin, Xiao Zhang, Youming Chen, Huanyang Zhang, Baile School of Physical and Mathematical Sciences Invisibility Cloaking Boundary Condition A major issue in invisibility cloaking, which caused intense mathematical discussions in the past few years but still remains physically elusive, is the plausible singular boundary conditions associated with the singular metamaterials at the inner boundary of an invisibility cloak. The perfect cloaking phenomenon, as originally proposed by Pendry et al for electromagnetic waves, cannot be treated as physical before a realistic inner boundary of a cloak is demonstrated. Although a recent demonstration has been done in a waveguide environment, the exotic singular boundary conditions should apply to a general environment as in free space. Here we fabricate a metamaterial surface that exhibits the singular boundary conditions and demonstrate its performance in free space. Particularly, the phase information of waves reflected from this metamaterial surface is explicitly measured, confirming the singular responses of boundary conditions for an invisibility cloak. MOE (Min. of Education, S’pore) Accepted version 2017-08-16T08:15:49Z 2019-12-06T15:46:43Z 2017-08-16T08:15:49Z 2019-12-06T15:46:43Z 2016 Journal Article Wu, Q., Gao, F., Song, Z., Lin, X., Zhang, Y., Chen, H., et al. (2016). Experimental verification of free-space singular boundary conditions in an invisibility cloak. Journal of Optics, 18(4), 044008-. 2040-8978 https://hdl.handle.net/10356/84534 http://hdl.handle.net/10220/43594 10.1088/2040-8978/18/4/044008 en Journal of Optics © 2016 IOP Publishing Ltd (Institute of Physics). This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Optics, IOP Publishing Ltd (Institute of Physics). 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/10.1088/2040-8978/18/4/044008]. 8 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 Invisibility Cloaking
Boundary Condition
spellingShingle Invisibility Cloaking
Boundary Condition
Wu, Qiannan
Gao, Fei
Song, Zhengyong
Lin, Xiao
Zhang, Youming
Chen, Huanyang
Zhang, Baile
Experimental verification of free-space singular boundary conditions in an invisibility cloak
description A major issue in invisibility cloaking, which caused intense mathematical discussions in the past few years but still remains physically elusive, is the plausible singular boundary conditions associated with the singular metamaterials at the inner boundary of an invisibility cloak. The perfect cloaking phenomenon, as originally proposed by Pendry et al for electromagnetic waves, cannot be treated as physical before a realistic inner boundary of a cloak is demonstrated. Although a recent demonstration has been done in a waveguide environment, the exotic singular boundary conditions should apply to a general environment as in free space. Here we fabricate a metamaterial surface that exhibits the singular boundary conditions and demonstrate its performance in free space. Particularly, the phase information of waves reflected from this metamaterial surface is explicitly measured, confirming the singular responses of boundary conditions for an invisibility cloak.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Wu, Qiannan
Gao, Fei
Song, Zhengyong
Lin, Xiao
Zhang, Youming
Chen, Huanyang
Zhang, Baile
format Article
author Wu, Qiannan
Gao, Fei
Song, Zhengyong
Lin, Xiao
Zhang, Youming
Chen, Huanyang
Zhang, Baile
author_sort Wu, Qiannan
title Experimental verification of free-space singular boundary conditions in an invisibility cloak
title_short Experimental verification of free-space singular boundary conditions in an invisibility cloak
title_full Experimental verification of free-space singular boundary conditions in an invisibility cloak
title_fullStr Experimental verification of free-space singular boundary conditions in an invisibility cloak
title_full_unstemmed Experimental verification of free-space singular boundary conditions in an invisibility cloak
title_sort experimental verification of free-space singular boundary conditions in an invisibility cloak
publishDate 2017
url https://hdl.handle.net/10356/84534
http://hdl.handle.net/10220/43594
_version_ 1759855263715688448