Observation of Faraday Rotation and Magnetic Circular Dichroism in an Optical Near-Field Probe Coated with Fe

Tadashi KAWAZOE  Shinya MARUYAMA  Kiyoshi KOBAYASHI  Motoichi OHTSU  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.9   pp.1850-1852
Publication Date: 2005/09/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.9.1850
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Nanophotonics and Related Techniques)
Category: 
Keyword: 
polarization,  optical near-field,  magneto-optical effect,  optical properties of magnetic materials,  plasmon,  

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Summary: 
We demonstrate a novel fiber device exhibiting magnetic circular dichroism (MCD) and Faraday rotation in sharpened optical fibers coated with Fe. The degree of MCD was 0.68 in a magnetic field of 0.35 T and the Faraday rotation angle was as great as 110 degrees. Such great magneto-optical effect is due to optical near-field interactions in the sub-wavelength region, i.e., in the tip of the near-field fiber probe. These effects can be attributed to the large magnitude of the magneto optical coefficient of Fe.