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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
IEICE TRANSACTIONS on Electronics
Publication Date: 2005/09/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Nanophotonics and Related Techniques)
polarization, optical near-field, magneto-optical effect, optical properties of magnetic materials, plasmon,
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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.