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.
Original language | English |
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Article number | 035419 |
Pages (from-to) | 1-4 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 86 |
Issue number | 3 |
DOIs | |
Publication status | Published - 13 Jul 2012 |
MoE publication type | A1 Journal article-refereed |
Keywords
- electric dipole-free interaction
- metamaterials
- plasmonics