Alfonso Cebollada

  • Citations Per Year
Learn More
Surface-plasmon-mediated confinement of optical fields holds great promise for on-chip miniaturization of all-optical circuits1-4• Following successful demonstrations of passive nanoplasmonic devicess-7, active plasmonic systems have been designed to control plasmon propagation. This goal has been achieved either by coupling plasmons to optically active(More)
It is well known that localized surface plasmon resonances (LSPRs) greatly influence the optical properties of metallic nanostructures. The spectral location of the LSPR is sensitive to the shape, size, and composition of the nanostructure, as well as on the optical properties of the surrounding dielectric. The latter effect has been used to develop(More)
Metal-dielectric Au-Co-SiO(2) magnetoplasmonic nanodisks are found to exhibit large magneto-optical activity and low optical losses. The internal architecture of the nanodisks is such that, in resonant conditions, the electromagnetic field undertakes a particular spatial distribution. This makes it possible to maximize the electromagnetic field at the(More)
J. B. González-Díaz,1 A. García-Martín,1 G. Armelles,1 J. M. García-Martín,1 C. Clavero,1 A. Cebollada,1,2 R. A. Lukaszew,3 J. R. Skuza,3 D. P. Kumah,2 and R. Clarke2 1Instituto de Microelectrónica de Madrid, Consejo Superior de Investigaciones Científicas, Isaac Newton 8, Tres Cantos, E-28760 Madrid, Spain 2FOCUS Center, University of Michigan, Ann Arbor,(More)
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(More)
Here we present a novel active system, which combines the plasmon resonance enhancement of the magneto-optical activity in magnetoplasmonic nanostructures and the strong electromagnetic field localization of split ring resonators. The structures consist of a gold split ring resonator placed on top of a gold nanoring in the section of which a Co nanodot is(More)
We show that the interaction between a plasmonic and a magnetoplasmonic metallic nanodisk leads to the appearance of magneto-optical activity in the purely plasmonic disk induced by the magnetoplasmonic one. Moreover, at specific wavelengths the interaction cancels the net electromagnetic field at the magnetoplasmonic component, strongly reducing the(More)
Acting on optical magnetic dipoles opens novel routes to govern light-matter interaction. We demonstrate magnetic field modification of the magnetic dipolar moment characteristic of resonant nanoholes in thin magnetoplasmonic films. This is experimentally shown through the demonstration of the magneto-optical analogue of Babinet's principle, where mirror(More)
The magnetic modulation of the surface plasmon-polariton (SPP) wavevector is experimentally and theoretically studied for the plasmonic modes excited in metal-insulator-metal (MIM) magnetoplasmonic cavities. For this purpose, Ag/SiO₂/Ag multilayers with different SiO₂ layer thickness in which a thin Co layer is positioned near the top Ag/SiO₂ interface,(More)
Epitaxial Fe/MgO heterostructures have been grown on Si~001! by a combination of sputtering and laser ablation deposition techniques. The growth of MgO on Si~001! is mainly determined by the nature of the interface, with large lattice mismatch and the presence of an amorphous layer of unclear origin. Reflection high energy electron diffraction patterns of(More)