Mapping magnetic near-field distributions of plasmonic nanoantennas

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

*Corresponding author for this work

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

We present direct experimental mapping of the lateral magnetic near-field distribution in plasmonic nanoantennas using aperture scanning near-field optical microscopy (SNOM). By means of full-field simulations it is demonstrated how the coupling of the hollow-pyramid aperture probe to the nanoantenna induces an effective magnetic dipole which efficiently excites surface plasmon resonances only at lateral magnetic field maxima. This excitation in turn affects the detected light intensity enabling the visualization of the lateral magnetic near-field distribution of multiple odd and even order plasmon modes with subwavelength spatial resolution.

Original languageEnglish
Pages (from-to)3168-3176
Number of pages9
JournalACS Nano
Volume7
Issue number4
DOIs
Publication statusPublished - 23 Apr 2013
Externally publishedYes

Keywords

  • hollow-pyramid probe
  • near-field imaging
  • optical magnetic field
  • optical nanobar antenna
  • probe-sample coupling
  • surface plasmon resonance

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  • Cite this

    Denkova, D., Verellen, N., Silhanek, A. V., Valev, V. K., Dorpe, P. V., & Moshchalkov, V. V. (2013). Mapping magnetic near-field distributions of plasmonic nanoantennas. ACS Nano, 7(4), 3168-3176. https://doi.org/10.1021/nn305589t