Electric dipole-free interaction of visible light with pairs of subwavelength-size silver particles

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2012-07-13
Major/Subject
Mcode
Degree programme
Language
en
Pages
4
1-4
Series
PHYSICAL REVIEW B, Volume 86, issue 3
Abstract
In subwavelength-sized particles, light-induced multipole moments of orders higher than the electric dipole are usually negligibly small, which allows for the light-matter interaction to be accurately treated within the electric dipole approximation. In this work we show that in a specially designed meta-atom, a disc metadimer, the electric quadrupole and magnetic dipole can be the only excitable multipoles. This condition is achieved in a narrow but tunable spectral range of visible light both for individual metadimers and for a periodic array of such particles. The electromagnetic fields scattered by the metadimers fundamentally differ from those created by electric dipoles. A metamaterial composed of such metadimers will therefore exhibit unusual optical properties.
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Keywords
electric dipole-free interaction, metamaterials, plasmonics
Other note
Citation
Grahn , P , Shevchenko , A & Kaivola , M 2012 , ' Electric dipole-free interaction of visible light with pairs of subwavelength-size silver particles ' , Physical Review B , vol. 86 , no. 3 , 035419 , pp. 1-4 . https://doi.org/10.1103/PhysRevB.86.035419