Multipolar interference for directed light emission

Ion M. Hancu, A.G. Curto, M. Castro-López, M. Kuttge, N.F. van Hulst

Research output: Contribution to journalArticleAcademicpeer-review

147 Citations (Scopus)

Abstract

By directing light, optical antennas can enhance light-matter interaction and improve the efficiency of nanophotonic devices. Here we exploit the interference among the electric dipole, quadrupole, and magnetic dipole moments of a split-ring resonator to experimentally realize a compact directional optical antenna. This single-element antenna design robustly directs emission even when covered with nanometric emitters at random positions, outperforming previously demonstrated nanoantennas with a bandwidth of 200 nm and a directivity of 10.1 dB from a subwavelength structure. The advantages of this approach bring directional optical antennas closer to practical applications.

Original languageEnglish
Pages (from-to)166-171
Number of pages6
JournalNano Letters
Volume14
Issue number1
DOIs
Publication statusPublished - 8 Jan 2014
Externally publishedYes

Keywords

  • directivity
  • electric quadrupole
  • magnetic dipole
  • Nanoantennas
  • split-ring resonators

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