  Recent efforts in the field of surface-enhanced spectroscopies have focused
on the paradigm of superchirality, entailing the engineering of the local
electromagnetic fields to boost the enantiospecific interaction between light
and chiral molecules. In this framework, approaches based on both metallic and
dielectric nanostructures have been proposed and have also recently been
extended to vibrational circular dichroism in the mid-infrared. In this work,
we design, fabricate and characterize arrays of chiral plasmonic slits
featuring enhanced chiral fields in the mid-infrared. We exploit collective
lattice resonances to further enhance the local intensity and to generate sharp
features in the circular dichroism spectra of the platform. Such features are
ideally suited to test the superchiral coupling with the vibrational resonances
of chiral molecules.
