Open AccessSpin Hall effect of reflected light in dielectric magneto-optical thin film with a double-negative metamaterial substrate
Author(s) -
Jie Li,
Tingting Tang,
Li Luo,
Nengxi Li,
Pengyu Zhang
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.019117
Subject(s) - metamaterial , spin hall effect , condensed matter physics , optics , physics , kerr effect , magneto optic kerr effect , magnetic field , dielectric , spin (aerodynamics) , optoelectronics , materials science , spin polarization , electron , magnetization , quantum mechanics , nonlinear system , thermodynamics
We study spin the Hall effect (SHE) of reflected light in a dielectric magneto-optical thin film of Ce 1 Y 2 Fe 5 O 12 (Ce:YIG) with a double-negative (DNG) metamaterial substrate. The spin-dependent splitting expressions of left- and the right-handed circularly polarized (LHCP and RHCP) components in longitudinal, polar and transverse magneto-optical Kerr effect (MOKE) configurations are obtained. Meanwhile we first obtain the analytical expressions of the SHE shift of reflected light for three MOKE configurations by proper approximation. Owing to the enhancement of the MOKE by DNG metamaterial, the external magnetic field shows a large enhancement and modulation to spin-dependent splitting of reflected light. Based on simulation results, the influences of magnetic field direction and substrate material on the transverse centroid shifts of the reflected left- and right-handed circularly polarized light perpendicular to incident plane are analyzed. We find the maximum spin-dependent splitting between LHCP and RHCP components achieves about 9.2 μm and the maximum value of the magneto-optical spin Hall effect (MOSHE) shift reaches 9 μm in polar MOKE configuration. In order to make our results convincing we use a realizable DNG metamaterial with silver nanostructures as substrate to verify our conclusion. The DNG metamaterial provides a flexible method to manipulate and enhance SHE of light.