Electric dipole-free interaction of visible light with pairs of subwavelength-size silver particles
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© 2012 American Physical Society (APS). http://www.aps.org/
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2012
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en
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035419
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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.Description
Keywords
metamaterial, metadimer, optical properties, light, interaction, light-matter interaction, electric quadrupole, magnetic dipole excitations
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Citation
Grahn, Patrick & Shevchenko, Andriy & Kaivola, Matti. 2012. Electric dipole-free interaction of visible light with pairs of subwavelength-size silver particles. Physical Review B. Volume 86, Issue 3, 035419. ISSN 1550-235X (electronic). ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.86.035419.