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Abnormal enhancement of electric field inside a thin permittivity-near-zero object in free space
KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
KTH, Skolan för elektro- och systemteknik (EES), Centra, Alfvénlaboratoriet.
KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.ORCID-id: 0000-0002-3401-1125
2010 (engelsk)Inngår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 82, nr 7, s. 075118-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

It is found that the electric field can be enhanced strongly inside a permittivity-near-zero object in free space, when the transverse cross section of the object is small and the length along the propagation direction of the incident wave is large enough as compared with the wavelength. The physical mechanism is explained in details. The incident electromagnetic energy can only flow almost normally through the outer surface into or out of the permittivity-near-zero object, which leads to large energy stream density and then strong electric field inside the object. Meanwhile, the magnetic field inside the permittivity-near-zero object may be smaller than that of the incident wave, which is also helpful for enhancing the electric field. Two permittivity-near-zero objects of simple shapes, namely, a thin cylindrical shell and a long thin rectangular bar, are chosen for numerical illustration. The enhancement of the electric field becomes stronger when the permittivity-near-zero object becomes thinner. The physical mechanism of the field enhancement is completely different from the plasmonic resonance enhancement at a metal surface.

sted, utgiver, år, opplag, sider
2010. Vol. 82, nr 7, s. 075118-
HSV kategori
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URN: urn:nbn:se:kth:diva-26868DOI: 10.1103/PhysRevB.82.075118ISI: 000280813100003Scopus ID: 2-s2.0-77957586305OAI: oai:DiVA.org:kth-26868DiVA, id: diva2:373687
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QC 20101201Tilgjengelig fra: 2010-12-01 Laget: 2010-11-29 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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