Localized surface plasmon resonance effects on the magneto-optical activity of continuous Au/Co/Au trilayers.
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).
Armelles
Gaspar
G
Instituto de Microelectrónica de Madrid (CSIC), 28760-Tres Cantos, Madrid, Spain. gaspar@imm.cnm.csic.es
González-Díaz
Juan Bautista
JB
García-Martín
Antonio
A
García-Martín
José Miguel
JM
Cebollada
Alfonso
A
Ujué González
María
M
Acimovic
Srdjan
S
Cesario
Jean
J
Quidant
Romain
R
Badenes
Gonçal
G
D000465:Algorithms; D003035:Cobalt / Q000737:chemistry*; D004574:Electromagnetic Fields; D004867:Equipment Design; D006046:Gold / Q000737:chemistry*; D008027:Light; D008280:Magnetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D015233:Models, Statistical; D036103:Nanotechnology / Q000379:methods; D010100:Oxygen / Q000737:chemistry; D017785:Photons; D012825:Silicon / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods*
D003035:Cobalt; D006046:Gold; D010100:Oxygen; D012825:Silicon