title: Direct near-field optical imaging of higher order plasmonic resonances.
abstract: We map in real space and by purely optical means near-field optical information of localized surface plasmon polariton (LSPP) resonances excited in nanoscopic particles. We demonstrate that careful polarization control enables apertureless scanning near-field optical microscopy (aSNOM) to image dipolar and quadrupolar LSPPs of the bare sample with high fidelity in both amplitude and phase. This establishes a routine method for in situ optical microscopy of plasmonic and other resonant structures under ambient conditions.
authors.affiliation: Max Planck Institut fur Festkörperforschung, 70569 Stuttgart, Germany. ruben.esteban@em2c.ecp.fr
authors.forename: R
authors.initials: R
authors.lastname: Esteban
authors.forename: R
authors.initials: R
authors.lastname: Vogelgesang
authors.forename: J
authors.initials: J
authors.lastname: Dorfmüller
authors.forename: A
authors.initials: A
authors.lastname: Dmitriev
authors.forename: C
authors.initials: C
authors.lastname: Rockstuhl
authors.forename: C
authors.initials: C
authors.lastname: Etrich
authors.forename: K
authors.initials: K
authors.lastname: Kern
mesh_terms: D004867:Equipment Design; D008853:Microscopy / Q000379:methods*; D008854:Microscopy, Electron / Q000379:methods; D020527:Microscopy, Scanning Probe / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D055095:Optics and Photonics; D020349:Surface Plasmon Resonance; D013499:Surface Properties