Abstract
The optical and magneto-optical behavior in periodically nanostructured surfaces at the threshold of surface continuity is revealed. We address Co films that evolve from an island-like array to a connecting network of islands that form a membrane pattern. The analysis of magneto-optical spectra as well as numerical simulations show significant differences between continuous and broken membranes that depend dramatically on the energy of the incoming radiation. Light localization increases the magneto-optical signal in the membranes. However, the generation of hot spots is not accompanied with magneto-optic enhancement. The electromagnetic field profile within the membrane system can explain the differences in the transmission and in the magneto-optic Kerr signal.
Highlights
Patterned ferromagnetic/plasmonic metal films can exhibit strong plasmonic and magnetoplasmonic activity resulting in large enhancement of magneto-optical effects in the presence of localized or propagating surface plasmons [1,2,3]
All nanostructures were obtained using lithography by self-assembly of colloidal nanospheres. [20, 21] Polystyrene nanospheres with a diameter of a = 470 nm have been deposited under appropriate conditions on 0.5 mm thick quartz subtrates
The presented set of Co nanostructured thin films were prepared by nanosphere lithography, a method that enabled the fabrication of continuous, anti-dot structures as well as of broken, island-like arrays
Summary
Patterned ferromagnetic/plasmonic metal films can exhibit strong plasmonic and magnetoplasmonic activity resulting in large enhancement of magneto-optical effects in the presence of localized or propagating surface plasmons [1,2,3]. The electromagnetic field profile within the membrane system can explain the differences in the transmission and in the magneto-optic Kerr signal.
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