title: Magnetic field concentrator for probing optical magnetic metamaterials.
abstract: Development of all dielectric and plasmonic metamaterials with a tunable optical frequency magnetic response creates a need for new inspection techniques. We propose a method of measuring magnetic responses of such metamaterials within a wide range of optical frequencies with a single probe. A tapered fiber probe with a radially corrugated metal coating concentrates azimuthally polarized light in the near-field into a subwavelength spot the longitudinal magnetic field component which is much stronger than the perpendicular electric one. The active probe may be used in a future scanning near-field magnetic microscope for studies of magnetic responses of subwavelength elementary cells of metamaterials.
authors.affiliation: Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, Pawi´nskiego 5A, 02-106 Warsaw, Poland. tantos@igf.fuw.edu.pl
authors.forename: Tomasz J
authors.initials: TJ
authors.lastname: Antosiewicz
authors.forename: Piotr
authors.initials: P
authors.lastname: Wróbel
authors.forename: Tomasz
authors.initials: T
authors.lastname: Szoplik
mesh_terms: D017076:Computer-Aided Design; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008280:Magnetics / Q000295:instrumentation*; D008420:Manufactured Materials / Q000032:analysis*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D014159:Transducers