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.
Near field scanning optical microscopy
Optical frequency
Silica
Magnetic fields
Artificial material
magnetic metamaterials
Single probe
Magnetic microscopes
optical magnetism
Near-field
Angular width
Probes
scanning near-field magnetic microscopy
Magnetic permeability
Tapered fiber
Magnetic response
Metal-coated
Metamaterials
Elementary cells
Silica fibers
corrugated SNOM probes
Longitudinal magnetic fields
Sub-wavelength
Incident light
plasmonics
Author
P. Wróbel
Uniwersytet Warszawski
T. Stefaniuk
Uniwersytet Warszawski
Tomasz Antosiewicz
Chalmers, Applied Physics, Condensed Matter Theory
T. Szoplik
Uniwersytet Warszawski
Proceedings of SPIE - The International Society for Optical Engineering
0277786X (ISSN) 1996756X (eISSN)
Vol. 8423 84231T978-0-8194-9115-2 (ISBN)
Subject Categories (SSIF 2011)
Other Engineering and Technologies
Condensed Matter Physics
DOI
10.1117/12.922912
ISBN
978-0-8194-9115-2