title: Amplitude- and phase-resolved optical near fields of split-ring-resonator-based metamaterials.
abstract: We investigate the local optical response of split-ring resonator-(SRR)-based metamaterials with an apertureless scanning near-field optical microscope. By mapping the near fields of suitably resonant micrometer-sized SRRs in the near-infrared spectral region with an uncoated silicon tip, we obtain a spatial resolution of better than lambda/50. The experimental results confirm numerical predictions of the near-field excitations of SRRs. Combining experimental near-field optical studies with near- and far-field optical simulations provides a detailed understanding of resonance mechanisms in subwavelength structures and will facilitate an efficient approach to improved designs.
authors.affiliation: 4. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany. t.zentgraf@fkf.mpg.de
authors.forename: T
authors.initials: T
authors.lastname: Zentgraf
authors.forename: J
authors.initials: J
authors.lastname: Dorfmüller
authors.forename: C
authors.initials: C
authors.lastname: Rockstuhl
authors.forename: C
authors.initials: C
authors.lastname: Etrich
authors.forename: R
authors.initials: R
authors.lastname: Vogelgesang
authors.forename: K
authors.initials: K
authors.lastname: Kern
authors.forename: T
authors.initials: T
authors.lastname: Pertsch
authors.forename: F
authors.initials: F
authors.lastname: Lederer
authors.forename: H
authors.initials: H
authors.lastname: Giessen