Anomalous polarization conversion in arrays of ultrathin ferromagnetic nanowires

作者：Stashkevich Andrey A^*; Roussigne Yves; Poddubny Alexander N; Cherif S M; Zheng Y; Vidal Franck; Yagupov Ilya V; Slobozhanyuk Alexei P; Belov Pavel A; Kivshar Yuri S

来源：Physical Review B, 2015, 92(21): 214436.

DOI：10.1103/PhysRevB.92.214436

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 enhancement 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.

• 出版日期2015-12-28