Surface plasmons and magneto-optical activity in hexagonal Ni antidot arrays
2012 (English)Conference paper, Abstract (Other academic)
The interaction between the surface plasmon polaritons (SPPs) and a magnetic field in a pure magnetic metal is presented in this work. By utilizing nano patterned structures one can create plasmonic resonances on magnetic surfaces. We have investigated how hexagonal arrays of circular holes (250-275 nm) in a Ni matrix (anti-dot arrays) couple to plasmonic resonances and therefore how it changes the optical and magnetooptical spectra. We have performed angularly resolved scans of the reflectivity and transmission with and without application of magnetic field and compared them to theoretical calculations. We present signatures of SPPs as troughs in reflectivity and extraordinary transmission through the holes. In the plasmonic regimes a big enhancement of the magneto-optical response (polar moke) is observed. Application of a transverse magnetic field influences the excitation of SPPs as it can be seen by the big increase of magnetic contrast measured in the transverse MOKE configuration. These effects pave the road for the development of new optical components and sensors with great application potential.
Place, publisher, year, edition, pages
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-262630OAI: oai:DiVA.org:uu-262630DiVA: diva2:854714
The 19th International Conference on Magnetism