Multiresonant broadband optical antennas as efficient tunable nanosources of second harmonic light

Research output: Contribution to journalArticlepeer-review


  • Heykel Aouani
  • Mohsen Rahmani
  • Themistoklis P H Sidiropoulos
  • Minghui Hong
  • Rupert F. Oulton
  • Stefan A. Maier

Colleges, School and Institutes

External organisations

  • Imperial College London
  • National University of Singapore


We report the experimental realization of efficient tunable nanosources of second harmonic light with individual multiresonant log-periodic optical antennas. By designing the nanoantenna with a bandwidth of several octaves, simultaneous enhancement of fundamental and harmonic fields is observed over a broad range of frequencies, leading to a high second harmonic conversion efficiency, together with an effective second order susceptibility within the range of values provided by widespread inorganic crystals. Moreover, the geometrical configuration of the nanoantenna makes the generated second harmonic signal independent from the polarization of the fundamental excitation. These results open new possibilities for the development of efficient integrated nonlinear nanodevices with high frequency tunability.


Original languageEnglish
Pages (from-to)4997-5002
Number of pages6
JournalNano Letters
Issue number9
Publication statusPublished - 12 Sep 2012


  • broadband optical antenna, field enhancement, nanoantenna, nonlinear optics, Plasmonic, second harmonic generation