Localized surface plasmon resonance effects on the magneto-optical activity of continuous Au/Co/Au trilayers.

نویسندگان

  • Gaspar Armelles
  • Juan Bautista González-Díaz
  • Antonio García-Martín
  • José Miguel García-Martín
  • Alfonso Cebollada
  • María Ujué González
  • Srdjan Acimovic
  • Jean Cesario
  • Romain Quidant
  • Gonçal Badenes
چکیده

We study how the magneto-optical activity in polar configuration of continuous Au/Co/Au trilayers is affected by the excitation of localized plasmon resonances of an array of Au nanodiscs fabricated on top of them over a dielectric SiO(2) spacer. We show that the effect of the nanodiscs array is twofold. First, it optimizes the absorption of light at specific photon energies corresponding to the localized surface plasmon excitation of the array, modifying the reflectivity of the system (we define this effect as the purely optical contribution). Second, upon localized plasmon resonance excitation, the electromagnetic field in the whole system is redistributed, and an enhanced magneto-optical activity occurs at those energies where the electromagnetic field in the magnetic layer is increased (this effect is identified as the purely magneto-optical contribution of the nanodiscs array).

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عنوان ژورنال:
  • Optics express

دوره 16 20  شماره 

صفحات  -

تاریخ انتشار 2008