Lateral magnetic near-field imaging of plasmonic nanoantennas with increasing complexity

Denitza Denkova*, Niels Verellen, Alejandro V. Silhanek, Pol Van Dorpe, Victor V. Moshchalkov

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The design of many promising, newly emerging classes of photonic metamaterials and subwavelength confinement structures requires detailed knowledge and understanding of the electromagnetic near-field interactions between their building blocks. While the electric field distributions and, respectively, the electric interactions of different nanostructures can be routinely measured, for example, by scattering near-field microscopy, only recently experimental methods for imaging the magnetic field distributions became available. In this paper, we provide direct experimental maps of the lateral magnetic near-field distributions of variously shaped plasmonic nanoantennas by using hollow-pyramid aperture scanning near-field optical microscopy (SNOM). We study both simple plasmonic nanoresonators, such as bars, disks, rings and more complex antennas. For the studied structures, the magnetic near-field distributions of the complex resonators have been found to be a superposition of the magnetic near-fields of the individual constituting elements. These experimental results, explained and validated by numerical simulations, open new possibilities for engineering and characterization of complex plasmonic antennas with increased functionality. Direct experimental maps of the lateral magnetic near-field distributions of different plasmonic nanoantennas are obtained by hollow-pyramid aperture scanning near-field optical microscopy. Both simple plasmonic nanoresonators (bars, disks, rings) and more complex structures are investigated. The magnetic near-field distributions of the studied complex resonators are found to be a superposition of the magnetic near-fields of the individual constituting elements.

Original languageEnglish
Pages (from-to)1959-1966
Number of pages8
JournalSmall
Volume10
Issue number10
DOIs
Publication statusPublished - 28 May 2014
Externally publishedYes

Keywords

  • field superposition
  • nanoantenna interactions
  • near-field imaging
  • optical magnetic field
  • surface plasmon resonance

Fingerprint Dive into the research topics of 'Lateral magnetic near-field imaging of plasmonic nanoantennas with increasing complexity'. Together they form a unique fingerprint.

Cite this