Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 90: Sensing, Active Structures and other Applications

O 90.5: Talk

Thursday, March 19, 2015, 16:00–16:15, MA 144

Correlation between near-field distribution and enhanced magneto-optical Kerr effect in a patterned magneto-plasmonic Ni sample — •Markus Rollinger¹, Evangelos Papaioannou¹, Philip Thielen¹, Pascal Melchior¹, Björn Obry¹, Emil Melander², Erik Östman², Vassilios Kapaklis², Mirko Cinchetti¹, and Martin Aeschlimann¹ — ¹Physics Department and OPTIMAS, University of Kaiserslautern, Germany — ²Department of Physics and Astronomy, Uppsala University, Sweden

The combination of magnetic and plasmonic nanostructures can be used to modify magneto-optical properties leading to an enhancement of the observed polar and transverse magneto-optic Kerr effect (MOKE) [Opt. Expr. 19,23867]. Thin metallic film with a periodic array of holes are a commonly used structure exhibiting extraordinary optical properties due to the presence of plasmonic excitations [Nature 391,667].

We investigate Si / Ti (2 nm) / Ni (100 nm) / Au (2 nm) samples that are patterned with a two-dimensional hexagonal array of holes (anti-dots) with a diameter of d = 275 nm and a pitch size of a = 470 nm. The magnetic Ni layer gives rise to a MOKE signal while the periodic nanopattern in principle supports surface propagating plasmons (SPP). We show the correlation between the enhanced MOKE signal and the electric near-field distribution, which is spatially detected by photoemission electron microscopy (PEEM) for different excitation wavelengths and polarization directions with respect to the anti-dot lattice geometry.