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Abnormal enhancement of electric field inside a thin permittivity-near-zero object in free space
KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-3401-1125
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 82, no 7, 075118- p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2010. Vol. 82, no 7, 075118- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-26868DOI: 10.1103/PhysRevB.82.075118ISI: 000280813100003Scopus ID: 2-s2.0-77957586305OAI: oai:DiVA.org:kth-26868DiVA: diva2:373687
Note
QC 20101201Available from: 2010-12-01 Created: 2010-11-29 Last updated: 2017-12-12Bibliographically approved

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He, Sailing

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Zhejiang-KTH Joint Research Center of Photonics, JORCEPAlfvén Laboratory Centre for Space and Fusion Plasma PhysicsElectromagnetic Engineering
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