title: Mapping magnetic near-field distributions of plasmonic nanoantennas.
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.
authors: INPAC-Institute for Nanoscale Physics and Chemistry, Physics Department, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium. Denitza.Denkova@fys.kuleuven.be
authors: Denitza
authors: D
authors: Denkova
authors: Niels
authors: N
authors: Verellen
authors: Alejandro V
authors: AV
authors: Silhanek
authors: Ventsislav K
authors: VK
authors: Valev
authors: Pol
authors: P
authors: Van Dorpe
authors: Victor V
authors: VV
authors: Moshchalkov
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D060526:Magnetic Fields; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation*; D011829:Radiation Dosage; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers