  In this study, we introduce various chiro-optical structures comprising
single, dimer, or trimer arrangements of plasmonic nanoantennas capable of
actively modulating the chiral transmission of light through the application of
an external magnetic field. Specifically, we explore monomers, dimers, and
trimers of trapezoidal nanoantennas, as well as trimer configurations of
triangular nanoantennas, with Au nanoparticles serving as the plasmonic
elements. To enable active magnetic control over the chiro-optical response in
these chiral plasmonic systems, Ni is incorporated as the active
magneto-plasmonic element. Our findings not only confirm the chirality of all
proposed structures but also demonstrate the feasibility of magnetically
manipulating the chiro-optical response within these configurations. This study
provides valuable insights into the field of chiral magneto-plasmonic
nanophotonic systems.
