Anomalous absorption, plasmonic resonances, and invisibility of radially anisotropic spheres

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Wallén, Henrik Kettunen, Henrik Sihvola, Ari 2015-07-17T09:00:49Z 2015-07-17T09:00:49Z 2015
dc.identifier.citation Wallén, Henrik & Kettunen, Henrik & Sihvola, Ari. 2015. Anomalous absorption, plasmonic resonances, and invisibility of radially anisotropic spheres. Radio Science. Volume 50, Issue 1. 18-28. 0048-6604 (printed). DOI: 10.1002/2014RS005534. en
dc.identifier.issn 0048-6604 (printed)
dc.description.abstract This article analyzes the response of a sphere with radially anisotropic permittivity dyadic (RA sphere), in both the electrostatic and full electrodynamic settings. Depending on the values and signs of the permittivity components, the quasistatic polarizability of the RA sphere exhibits several very different interesting properties, including invisibility, field concentration, resonant singularities, and emergent losses. Special attention is given to the anomalous losses that appear in the case of certain hyperbolic anisotropy values. We show that their validity can be justified in a limiting sense by puncturing the sphere at the origin and adding a small imaginary part into the permittivity components. A hyperbolic RA sphere with very small intrinsic losses can thus have significant effective losses making it an effective absorber. With different choices of permittivities, the RA sphere could also perform as a cloak or a sensor. The Mie scattering results by an RA sphere are used to justify the quasistatic calculations. It is shown that in the small parameter limit the absorption efficiency of an RA sphere is nonzero for certain lossless hyperbolic anisotropies. The absorption and scattering efficiencies agree with the quasistatic calculations fairly well for spheres with size parameters up to 1/3. en
dc.format.extent 18-28
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Geophysical Union en
dc.relation.ispartofseries Radio Science en
dc.relation.ispartofseries Volume 50, Issue 1
dc.rights © 2015 American Geophysical Union. en
dc.subject.other Electrical engineering en
dc.title Anomalous absorption, plasmonic resonances, and invisibility of radially anisotropic spheres en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder American Geophysical Union Sähkötekniikan korkeakoulu fi School of Electrical Engineering en
dc.contributor.department Radiotieteen ja -tekniikan laitos fi
dc.contributor.department Department of Radio Science and Engineering en
dc.subject.keyword radial anisotropy en
dc.subject.keyword polarizability en
dc.subject.keyword scattering en
dc.subject.keyword absorption en
dc.identifier.urn URN:NBN:fi:aalto-201504202358
dc.type.dcmitype text en
dc.identifier.doi 10.1002/2014RS005534
dc.type.version Final published version en

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