Open AccessMagneto-Optical Response of Cobalt Interacting with Plasmonic Nanoparticle Superlattices
Author(s) -
Michael B. Ross,
Marc R. Bourgeois,
Chad A. Mirkin,
George C. Schatz
Publication year - 2016
Publication title -
the journal of physical chemistry letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.563
H-Index - 203
ISSN - 1948-7185
DOI - 10.1021/acs.jpclett.6b02259
Subject(s) - plasmon , materials science , superlattice , cobalt , volume fraction , optoelectronics , kerr effect , anisotropy , nanoparticle , condensed matter physics , optics , nanotechnology , physics , nonlinear system , quantum mechanics , metallurgy , composite material
The magneto-optical Kerr effect is a striking phenomenon whereby the optical properties of a material change under an applied magnetic field. Though promising for sensing and data storage technology, these properties are typically weak in magnitude and are inherently limited by the bulk properties of the active magnetic material. In this work, we theoretically demonstrate that plasmonic thin-film assemblies on a cobalt substrate can achieve tunable transverse magneto-optical (TMOKE) responses throughout the visible and near-infrared (300-900 nm). In addition to exhibiting wide spectral tunability, this response can be varied in sign and magnitude by changing the plasmonic volume fraction (1-20%), the composition and arrangement of the assembly, and the shape of the nanoparticle inclusions. Of particular interest is the newly discovered sensitivity of the sign and intensity of the TMOKE spectrum to collective metallic plasmonic behavior in silver, mixed silver-gold, and anisotropic superlattices.