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MISM-2014

OPTICAL AND MAGNETO-OPTICAL SPECTROSCOPY IN 2D MAGNETOPLASMONIC
NANOGRATINGS
Chetvertukhin A.V. 1, Musorin A.I. 1, Grunin A.A. 1, Dolgova T.V. 1, Uchida
H.2, Inoue M.3, Fedyanin A.A.1
1 Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
fedyanin@nanolab.phys.msu.ru
2 Tohoku Institute of Technology, Sendai, Japan
3 Toyohashi University of Technology, Toyohashi, Japan

Magneto-optical effects can be greatly enhanced in periodic
nanostructured materials due to plasmonic, photonic and other resonant
effects [1, 2]. One of the modern techniques to observe magnetoplasmonic
effects is the use of magnetoplasmonic crystals. Periodic nanostructuring
of magnetoplasmonic crystals allows one to control propagation of surface
plasmon polaritons (SPP) by the use of diffraction maxima to satisfy
fulfill phase-matching for incident light and SPP. 2D-periodicity provides
the opportunity of spectral tuning of the phase-matching conditions via
superposition of two vectors of the reciprocal lattice. In some materials
there is an ability to simultaneously excite two intersecting
magnetoplasmons providing opportunity to form a standing plasmonic wave
that leads to formation of plasmonic band gap [5]. As local as propagating
surface plasmons were used to control the magneto-optical signal of
nanoparticles and multilayered structures [3, 4]. In this work, the
transversal magneto-optical Kerr effect (TKE) is studied in two-dimensional
magnetoplasmonic crystals. Resonant enhancement of the Kerr effect is
observed and can be attributed to the resonant excitation and the
interaction between magnetoplasmonic modes, waveguide modes and effects
that are emerging when diffraction maxima lays into the plane of structure.


|[pic] |
|Fig. 1. AFM-image of the |
|2D magnetoplasmonic |
|nanostructured sample. |


The sample is 2D square lattice of Au disks placed on 1-mm-thick
quartz substrate. 100-nm-thick Bi:YIG layer covers the structure. The
sample is characterized by an atomic force microscopy (Fig.1). The period
of the lattices is 600 nm. The Au disks height is about 60 nm and their
diameters are about 100 nm. According to vibrating sample magnetometry
measurements the saturation field is 1 kOe.
Optical and magneto-optical spectra of the sample were measured at
different azimuthal angles and polarizations. There is a distinct
correlation between the spectral positions of plasmonic resonances and the
resonances in TKE spectra.

[1] M. Inoue, et al. ,J. Phys. D 39, R151, (2006).
[2] V.I. Belotelov et al., Nature Nanotech. 6, 370, (2011)
[3] H. Uchida, et al., J. Magn. Magn. Mat. 321, 843, (2009).
[4] A.A. Grunin et al., ,Appl. Phys. Lett., 97, 261908, (2010).
[5] A.V. Chetvertukin et al., J. Appl. Phys., 113, 17A942, (2013)