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Electric dipole-free interaction of visible light with pairs of subwavelength-size silver particles
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors
Grahn, P.
Shevchenko, A.
Kaivola, M.
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en
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4
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Physical Review B, Volume 86, issue 3, pp. 1-4
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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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