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Title: Experimental verification of free-space singular boundary conditions in an invisibility cloak
Authors: Wu, Qiannan
Gao, Fei
Song, Zhengyong
Lin, Xiao
Zhang, Youming
Chen, Huanyang
Zhang, Baile
Keywords: Invisibility Cloaking
Boundary Condition
Issue Date: 2016
Source: 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-.
Series/Report no.: Journal of Optics
Abstract: 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.
ISSN: 2040-8978
DOI: 10.1088/2040-8978/18/4/044008
Rights: © 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: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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