Concentrator of magnetic field of light
Paper in proceeding, 2012
In the recent decade metamaterials with magnetic permeability different than unity and unusual response to the magnetic field of incident light have been intensively explored. Existence of magnetic artificial materials created an interest in a scanning near-field magnetic microscope for studies of magnetic responses of subwavelength elementary cells of those metamaterials. We present a method of measuring magnetic responses of such elementary cells within a wide range of optical frequencies with single probes of two types. The first type probe is made of a tapered silica fiber with radial metal stripes separated by equidistant slits of constant angular width. The second type probe is similar to metal coated, corrugated, tapered fiber apertured SNOM probe, but in this case corrugations are radially oriented. Both types of probes have internal illumination with azimuthally polarized light. In the near-field they concentrate into a subwavelength spot the longitudinal magnetic field component which is much stronger than the perpendicular electric one.
Single probe
Near field scanning optical microscopy
Angular width
Sub-wavelength
magnetic metamaterials
optical magnetism
plasmonics
Probes
Magnetic permeability
corrugated SNOM probes
Optical frequency
Metal-coated
Artificial material
Silica
Elementary cells
scanning near-field magnetic microscopy
Longitudinal magnetic fields
Tapered fiber
Silica fibers
Metamaterials
Magnetic fields
Near-field
Magnetic microscopes
Incident light
Magnetic response
Author
P. Wróbel
University of Warsaw
T. Stefaniuk
University of Warsaw
Tomasz Antosiewicz
Chalmers, Applied Physics, Condensed Matter Theory
T. Szoplik
University of Warsaw
Proceedings of SPIE - The International Society for Optical Engineering
0277786X (ISSN) 1996756X (eISSN)
Vol. 8423 84231T978-0-8194-9115-2 (ISBN)
Subject Categories
Other Engineering and Technologies
Condensed Matter Physics
DOI
10.1117/12.922912
ISBN
978-0-8194-9115-2