Concentrator of magnetic field of light
Paper i 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

Författare

P. Wróbel

Uniwersytet Warszawski

T. Stefaniuk

Uniwersytet Warszawski

Tomasz Antosiewicz

Chalmers, Teknisk fysik, Kondenserade materiens teori

T. Szoplik

Uniwersytet Warszawski

Proceedings of SPIE - The International Society for Optical Engineering

0277786X (ISSN)

Vol. 8423 84231T

Ämneskategorier

Annan teknik

Den kondenserade materiens fysik

DOI

10.1117/12.922912

ISBN

978-0-8194-9115-2