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Broadband THz Absorbers With Graphene-Based Anisotropic Metamaterial Films
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.ORCID iD: 0000-0002-3401-1125
2013 (English)In: IEEE Transactions on Terahertz Science and Technology, ISSN 2156-342X, Vol. 3, no 6, 757-763 p.Article in journal (Refereed) Published
Abstract [en]

We introduce a broadband THz absorber with an array of graphene-dielectric multilayered frustum pyramids on a metal sheet. The multilayered graphene-dielectric structure can be considered an effectively homogeneous metamaterial with an hyperbolic dispersion and anisotropic permittivity. Surface plasmonic waves are excited on graphene layers and the incident waves of different frequencies are absorbed at different levels of the stacked pyramid, due to the squeezing effect of the slow waves at the tapered waveguide. An absorption dip is observed and explained physically, and finally removed by adding a rectangular portion to the pyramid unit cell. High absorption with an extremely broad bandwidth from 8 THz to over 100 THz is achieved. The absorption spectrum of the present structure can be scaled down to a lower frequency (e.g. 2 THz) by increasing the size of the unit cell.

Place, publisher, year, edition, pages
2013. Vol. 3, no 6, 757-763 p.
Keyword [en]
Absorber, broadband, graphene, hyperbolic dispersion, metamaterials, scalable, slow light, terahertz (THz)
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-139221DOI: 10.1109/TTHZ.2013.2283370ISI: 000327723600013ScopusID: 2-s2.0-84890012663OAI: diva2:687298
Swedish Research Council, 621-2011-4620

QC 20140114

Available from: 2014-01-14 Created: 2014-01-08 Last updated: 2014-01-17Bibliographically approved

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He, Sailing
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Electromagnetic EngineeringZhejiang-KTH Joint Research Center of Photonics, JORCEP
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