  Plasmonic chirality exhibits great potential for novel nanooptical devices
due to the generation of a strong chiroptical response. Previous reports on
plasmonic chirality explanations are mainly based on phase retardation and
coupling. We propose a quantitative model similar to the chiral molecules for
explaining the mechanism of the intrinsic plasmonic chirality quantitatively
based on the interplay and mixing of electric and magnetic dipole modes, which
forms a mixed electric and magnetic polarizability. The analysis method is also
suitable for small chiral object down to quasi-static limit without phase delay
and expected to be a universal rule.
