Journal
OPTICS EXPRESS
Volume 16, Issue 20, Pages 16104-16112Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.016104
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Funding
- Spanish Ministry of Science and Education [NAN2004-09195-C04, MAT2005-05524-C02-01]
- Comunidad de Madrid [S-0505/MAT/0194 NANOMAGNET]
- European Commission through the NoE PHOREMOST [FP6/2003/IST/2-511616]
- Spanish Ministry of Education
- ICREA Funding Source: Custom
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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). (c) 2008 Optical Society of America
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