title: Photonic nanopatterns of gold nanostructures indicate the excitation of surface plasmon modes of a wavelength of 50-100 nm by scanning near-field optical microscopy.
abstract: Scanning near-field optical microscopy images of metal nanostructures taken with the tetrahedral tip (T-tip) show a distribution of dark and bright spots at distances in the order of 25-50 nm. The images are interpreted as photonic nanopatterns defined as calculated scanning near-field optical microscopy images using a dipole serving as a light-emitting scanning near-field optical microscopy probe. Changing from a positive to a negative value of the dielectric function of a sample leads to the partition of one spot into several spots in the photonic nanopatterns, indicating the excitation of surface plasmons of a wavelength in the order of 50-100 nm in metal nanostructures.
authors.affiliation: Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Münster, Germany.
authors.forename: H-J
authors.initials: HJ
authors.lastname: Maas
authors.forename: J
authors.initials: J
authors.lastname: Heimel
authors.forename: H
authors.initials: H
authors.lastname: Fuchs
authors.forename: U C
authors.initials: UC
authors.lastname: Fischer
authors.forename: J C
authors.initials: JC
authors.lastname: Weeber
authors.forename: A
authors.initials: A
authors.lastname: Dereux
mesh_terms: D006046:Gold / Q000032:analysis / Q000737:chemistry*; D008027:Light; D020527:Microscopy, Scanning Probe / Q000295:instrumentation / Q000379:methods*; D016252:Microscopy, Scanning Tunneling / Q000295:instrumentation / Q000379:methods; D036103:Nanotechnology; D017785:Photons; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance
chemical_list: D006046:Gold