Abstract
The influence of surface plasmons on the magneto-optic activity in a two-dimensional hexagonal array is addressed. The experiments were performed using hexagonal array of circular holes in a ferromagnetic Ni film. Well pronounced troughs are observed in the optical reflectivity, resulting from the presence of surface plasmons. The surface plasmons are found to strongly enhance the magneto-optic response (Kerr rotation), as compared to a continuous film of the same composition. The influence of the hexagonal symmetry of the pattern on the coupling between the plasmonic excitations is demonstrated, using optical diffraction measurements and theoretical calculations of the magneto-optic and of the angular dependence of the optical activity.
Highlights
The use of magnetic materials in plasmonic structures allows the coupling between plasmonic and magnetic states
Recent results in Au/ferromagnetic layer/Au heterostructures revealed the ability to control the propagation of surface plasmon polaritons (SPPs) at the metal-ferromagnetic interface, using an applied external magnetic field [1,2,3]
There are still many unresolved questions concerning the basic principles of the underlying effects and the root of the MO enhancement arising from the generation of surface plasmons at a magnetic metal/air interface must be considered as an open scientific question
Summary
The use of magnetic materials in plasmonic structures allows the coupling between plasmonic and magnetic states. The exploration of the effect on the magneto-optic (MO) activity in magneto-plasmonic structures has just started, the potential for utilization in optoelectronics [1], bio-sensors [4], and magnetic applications [5] are already apparent. Plasmonic states in pure ferromagnetic patterned Ni dots were revealed [8], while the generation of SPPs in perforated ferromagnetic. There are still many unresolved questions concerning the basic principles of the underlying effects and the root of the MO enhancement arising from the generation of surface plasmons at a magnetic metal/air interface must be considered as an open scientific question. The angular and energy dependent evolution of SPPs shows how the interactions of plasmonic excitation couple with the different length scales of the hexagonal pattern. We show to what extend these SPPs do influence the magneto-optic response
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