  Light scattering from chiral plasmonic structures can create near fields with
an asymmetry greater than the equivalent circularly polarised light, a property
sometimes referred to as superchirality. These near fields with enhanced chiral
asymmetries can be exploited for ultrasensitive detection of chiral
(bio)molecules. In this combined experimental and numerical modelling study, we
demonstrate that superchiral hot-spots are created around structural
heterogeneities, such has protrusions and indentations, possessed by all real
metal structures. These superchiral hot-spots, have chiral asymmetries greater
than what would be expected from an idealised perfect structure. Our work
indicates that surface morphology could play a role in determining the efficacy
of a chiral structure for sensing.
