Abstract
We present a theoretical study of the Faraday effect in hybrid magneto-plasmonic crystals that consist of Au-Co-Au perforated membranes with a periodic array of sub-wavelength holes. We show that in these hybrid systems the interplay between the extraordinary optical transmission and the magneto-optical activity leads to a resonant enhancement of the Faraday rotation, as compared to purely ferromagnetic membranes. In particular, we determine the geometrical parameters for which this enhancement is optimized and show that the inclusion of a noble metal like Au dramatically increases the Faraday rotation over a broad bandwidth. Moreover, we show that the analysis of the Faraday rotation in these periodically perforated membranes provides a further insight into the origin of the extraordinary optical transmission.
Highlights
The ability of metals to sustain surface plasmon polaritons (SPPs) has been the key to find new ways to concentrate light to sub-wavelength volumes and to manipulate its propagation in integrated photonic devices [1, 2]
We present a detailed study of the Faraday effect in our Au-Co-Au perforated membranes as a function of both the thickness of the Co layer, tCo, and its position d measured with respect to the upper part of the membrane
The corresponding Faraday rotation and the ellipticity are shown in Appendix A
Summary
The ability of metals to sustain surface plasmon polaritons (SPPs) has been the key to find new ways to concentrate light to sub-wavelength volumes and to manipulate its propagation in integrated photonic devices [1, 2]. The resonant excitation of plasmons and its consequent confinement of the electromagnetic field are used to enhance the magneto-optical response of the system. Following this idea, it has been shown that by hybridizing ferromagnetic materials with noble metals, often making use of periodic nanostructuration, different magneto-optical (MO) effects can be enhanced such as the polar MO Kerr effect [5,6,7], the Faraday effect [5, 8,9,10] or the transverse MO Kerr effect [11, 12], which makes hybrid magneto-plasmonic structures very attractive for technological applications
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