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Perfect absorption in ultrathin anisotropic epsilon-near-zero metamaterials
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University, China .
2014 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 105, no 2, 023504- p.Article in journal (Refereed) Published
Abstract [en]

Conventionally, perfect absorption by an ultrathin material usually requires a high material loss. In this paper, this common understanding is challenged. Our analytical solution shows that an anisotropic e-near-zero thin metamaterial (MM) backed by a metallic substrate can perfectly absorb an incident plane wave at a specific angle while the MM can be arbitrarily thin and arbitrarily low-loss. The counterintuitive phenomenon is due to coherent cancelling. As a proof, we demonstrate a microwave absorber working at 5.35 GHz using low-loss meander-line MMs with a thickness of only lambda/56. An absorption peak of 95% at a 60 degrees incidence angle is obtained experimentally, which verifies the analytical results well.

Place, publisher, year, edition, pages
2014. Vol. 105, no 2, 023504- p.
Keyword [en]
Terahertz Regime, Absorbers, Surface
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-153281DOI: 10.1063/1.4890397ISI: 000341151400076Scopus ID: 2-s2.0-84904723946OAI: oai:DiVA.org:kth-153281DiVA: diva2:752670
Note

QC 20141006

Available from: 2014-10-06 Created: 2014-10-03 Last updated: 2017-12-05Bibliographically approved

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