Magnetization-induced chirality in second harmonic generation response of U-shaped permalloy nanostructuresстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 7 марта 2019 г.
Аннотация:Magnetization-induced circular dichroism (CD) in optical second harmonic generation (SHG) is observed
in planar symmetrical arrays of U-shaped permalloy nanostructures. We demonstrate that extrinsic chirality
of an array leads to the CD effect that strongly depends on the azimuthal orientation of the sample. In the
absence of magnetization, the value of the SHG CD effect averaged over 2π azimuthal angle is zero, while
up to 6% averaged SHG CD appears as the dc magnetic field is applied along the symmetry axis of the
structure. Importantly the averaged SHG CD effect changes its sign under the reversal of the magnetic field,
which corresponds to the appearance of magnetization driven true chirality in an array of symmetric magnetic
nanostructures.