Surface plasmons and magneto-optic activity in hexagonal Ni anti-dot arrays

Details Surface plasmons and magneto-optic activity in hexagonal Ni anti-dot arrays Surface plasmons and magneto-optic activity in hexagonal Ni anti-dot arrays

2011-08-24

arxiv.org/abs/1108.4780v2

Optics Express, Vol. 19, Issue 24, pp. 23867-23877 (2011)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1364/OE.19.023867

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.

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