Anomalous polarization conversion in arrays of ultrathin ferromagnetic nanowires
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Stashkevich, Andrey A.
Roussigne, Yves
Poddubny, Alexander N.
Cherif, S.-M.
Zheng, Y.
Vidal, Frank
Yagupov, Ilya V.
Slobozhanyuk, A. P.
Belov, Pavel
Kivshar, Yuri
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American Physical Society
Abstract
We study the optical properties of arrays of ultrathin cobalt nanowires by means of the Brillouin scattering
of light on magnons. We employ the Stokes/anti-Stokes scattering asymmetry to probe the circular polarization
of a local electric field induced inside nanowires by linearly polarized light waves. We observe the anomalous
polarization conversion of the opposite sign than that in a bulk medium or thick nanowires with a great enhance-
ment of the degree of circular polarization attributed to the unconventional refraction in a nanowire medium. A
rigorous simulation of the electric field polarization as a function of the wire diameter and spacing reveals the
reversed polarization for a thin sparse wire array, in full quantitative agreement with experimental results.
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Physical Review B: Condensed Matter and Materials
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Open Access
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